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Why is a turbo 400 better than a 727?
#1114216
11/15/11 12:56 PM
11/15/11 12:56 PM
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Joined: Jan 2003
Posts: 4,244
Canada
Kam*Kuda
OP
master
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OP
master
Joined: Jan 2003
Posts: 4,244
Canada
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I see many high horsepower cars using a turbo 400 with lots of luck.
What are the internal workings that allow a 400 to be upgraded and work well.
Where are the weak points in the 727 or 400?
looking at 850-1000hp street strip car.
1970 Barracuda Convertible
1968 Satellite Street Strip car
1654.5 Mustang
1955 Land Rover
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Re: WHy is a turbo 4oo better than a 727?
[Re: IcorkSOAK]
#1114218
11/15/11 01:15 PM
11/15/11 01:15 PM
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Joined: May 2004
Posts: 12,505
Taxes & Virus's R-US, NY
Dragula
I Live Here
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I Live Here
Joined: May 2004
Posts: 12,505
Taxes & Virus's R-US, NY
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Quote:
IF I had a 1000 hp street car ,.. it would have a Lenco in it.
X2, but mine would be the Lenco drive version...If money allows someday, I just might put one in my +700hp street car!
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Re: Why is a turbo 400 better than a 727?
[Re: JohnRR]
#1114220
11/15/11 01:19 PM
11/15/11 01:19 PM
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Joined: Apr 2004
Posts: 12,339
somwhere
smokinwoody
I Live Here
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I Live Here
Joined: Apr 2004
Posts: 12,339
somwhere
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Quote:
I think it's because the 400 doesn't have that ticking bomb of a front drum to worry about , also it's cheaper to build one than a 727.
not really.... 
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Re: Why is a turbo 400 better than a 727?
[Re: smokinwoody]
#1114221
11/15/11 01:33 PM
11/15/11 01:33 PM
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Joined: Jan 2003
Posts: 75,339
A gulag near you.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,339
A gulag near you.
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Quote:
Quote:
I think it's because the 400 doesn't have that ticking bomb of a front drum to worry about , also it's cheaper to build one than a 727.
not really....
Not really what , the ticking bomb or the cost ?
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Re: Why is a turbo 400 better than a 727?
[Re: JohnRR]
#1114222
11/15/11 01:37 PM
11/15/11 01:37 PM
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Joined: Apr 2004
Posts: 12,339
somwhere
smokinwoody
I Live Here
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I Live Here
Joined: Apr 2004
Posts: 12,339
somwhere
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Quote:
Quote:
Quote:
I think it's because the 400 doesn't have that ticking bomb of a front drum to worry about , also it's cheaper to build one than a 727.
not really....
Not really what , the ticking bomb or the cost ?
cost....my 400 was just as much if not more than my CRT built 727...and add the 2 piece converter...over the top...Im selling mine for half of what I have in it and its never been in a car...
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Re: Why is a turbo 400 better than a 727?
[Re: smokinwoody]
#1114223
11/15/11 02:12 PM
11/15/11 02:12 PM
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Joined: Dec 2009
Posts: 21,299
in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
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Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 21,299
in a cattle trailer down by th...
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TH 400 can blow up too. It's just that it's a Chevrolet and there are more companies willing to produce good parts for them.
"Come get your wife"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Front and rear disc and hydroboost conversion.
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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Re: Why is a turbo 400 better than a 727?
[Re: IcorkSOAK]
#1114227
11/15/11 03:27 PM
11/15/11 03:27 PM
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Joined: Jul 2010
Posts: 417
reynoldsburg,ohio
poppaj
mopar
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mopar
Joined: Jul 2010
Posts: 417
reynoldsburg,ohio
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more power loss with a 400
AA/NSS 65'Coronet "Whompin Wedge"
Pop & Son Performance 557" B-1 power
John Holt Chassis
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Re: Why is a turbo 400 better than a 727?
[Re: 65dragnet]
#1114229
11/15/11 05:10 PM
11/15/11 05:10 PM
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Joined: Jan 2003
Posts: 75,339
A gulag near you.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,339
A gulag near you.
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Quote:
Quote:
A 727 is a TIME BOMB ?
With a aftermarket drum in it .... it is perfectly safe.
 Absolutely safe with steel front drum , lowband apply valvebody and 16 roller sprag 
With all those parts it is , but it's not cheap and most mopar guys are tightwads ...
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Re: Why is a turbo 400 better than a 727?
[Re: JohnRR]
#1114230
11/15/11 05:12 PM
11/15/11 05:12 PM
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Joined: Dec 2009
Posts: 21,299
in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
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Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 21,299
in a cattle trailer down by th...
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Quote:
Quote:
Quote:
A 727 is a TIME BOMB ?
With a aftermarket drum in it .... it is perfectly safe.
Absolutely safe with steel front drum , lowband apply valvebody and 16 roller sprag
With all those parts it is , but it's not cheap and most mopar guys are tightwads ...
So the 400 and the conversion is cheaper?
"Come get your wife"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Front and rear disc and hydroboost conversion.
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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Re: Why is a turbo 400 better than a 727?
[Re: Guitar Jones]
#1114231
11/15/11 05:14 PM
11/15/11 05:14 PM
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Joined: Jan 2003
Posts: 75,339
A gulag near you.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,339
A gulag near you.
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Quote:
Quote:
Quote:
Quote:
A 727 is a TIME BOMB ?
With a aftermarket drum in it .... it is perfectly safe.
Absolutely safe with steel front drum , lowband apply valvebody and 16 roller sprag
With all those parts it is , but it's not cheap and most mopar guys are tightwads ...
So the 400 and the conversion is cheaper?
You'll notice I said MOST ... I don't think it would be, but there is something that draws people away from the 727.
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Re: Why is a turbo 400 better than a 727?
[Re: Guitar Jones]
#1114232
11/15/11 05:15 PM
11/15/11 05:15 PM
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Joined: Aug 2005
Posts: 778
Southington Ct.
turbobitt
super stock
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super stock
Joined: Aug 2005
Posts: 778
Southington Ct.
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To bullet prof a TH400, your looking at a direct drum with super sprag $680, plus billet input shaft $300, plus all the other normal expense.
Almost forgot about billet intermediate shaft $230. Just as expensive I think...
Allan G.
Last edited by turbobitt; 11/15/11 05:21 PM.
1970 Challenger w/572 Hemi street car and my pride and joy.
1986 T-Type with 272 Stage 2 Buick V6 engine - True 8 second street car. Just updated the engine and put down 928 HP @ 35# boost to the ground on chasis dyno.
1976 Cee Bee Avenger Jet Boat - 460 Ford powered.
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Re: Why is a turbo 400 better than a 727?
[Re: Kam*Kuda]
#1114234
11/15/11 05:53 PM
11/15/11 05:53 PM
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Joined: Jan 2003
Posts: 27,004
Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,004
Rio Linda, CA
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There are a couple of things that make the TH400 "better" especially for drag racing.
When modified with a manual valve body you don't have the shift overlap problems inherent with the Torqueflite design, in the TH400 you just add clutches to upshift...no release/apply overlap.
Also, the "wrap around" case design of the Th400 is stronger than the open bottom design of the TF...less case flex.
As far as the "time bomb" argument...ALL automatic transmissions can explode; that's why NHRA requires diapers/shields on all of them.
The INTERNET, the MISinformation superhighway
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Re: Why is a turbo 400 better than a 727?
[Re: maximum entropy]
#1114236
11/15/11 06:06 PM
11/15/11 06:06 PM
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Joined: Dec 2009
Posts: 21,299
in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
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Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 21,299
in a cattle trailer down by th...
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Quote:
you'll never find a brand x tranny in my car. you may find a 727 in my brand x. 
I have felt this way for a very long time but at this point I may go to a 'glide when I have the coin to do so. Just saying. I really like my Duramax/Allison trans truck. Never in a thousand years would I have ever thought I'd say that...But times change...
"Come get your wife"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Front and rear disc and hydroboost conversion.
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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Re: Why is a turbo 400 better than a 727?
[Re: Guitar Jones]
#1114239
11/15/11 07:02 PM
11/15/11 07:02 PM
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Joined: Jul 2008
Posts: 30,632
Florida STAYcation
IcorkSOAK
Financed his waterbed
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Financed his waterbed
Joined: Jul 2008
Posts: 30,632
Florida STAYcation
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Quote:
Never in a thousand years would I have ever thought I'd say that...But times change...
So you are 1,073 years old ?  
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Re: Why is a turbo 400 better than a 727?
[Re: IcorkSOAK]
#1114240
11/15/11 07:06 PM
11/15/11 07:06 PM
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Joined: Dec 2009
Posts: 21,299
in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
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Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 21,299
in a cattle trailer down by th...
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Quote:
Quote:
Never in a thousand years would I have ever thought I'd say that...But times change...
So you are 1,073 years old ?
I told I'm 12 dammit! 
"Come get your wife"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Front and rear disc and hydroboost conversion.
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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Re: Why is a turbo 400 better than a 727?
[Re: joshking440]
#1114241
11/15/11 07:12 PM
11/15/11 07:12 PM
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Joined: Nov 2004
Posts: 4,330
Lynchburg, VA
Leon441
master
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master
Joined: Nov 2004
Posts: 4,330
Lynchburg, VA
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With the arguements you are making, Josh, the turbo 400 would eat power. Pro trans has been making record holding torqueflites for years. But, going back to what Josh brought up the converter ran in a Pro trans is deeper. A simple midplate made thick, fixes this problem.
I really wish guys would figure this one out. It is not the 727 designs from Mopar that blow up. If you drive it in drive with a ton of power yes. Some aftermarket valve bodies that we all used for years caused this phenomenom. They decided Low Band Apply was not necessary in race applications. Well many floarboards, feet and tranny cases later we know better. The sprags and drums from the aftermarket are better. The billet drums do not blow up. But, if you had the low/reverse band applied the drum wouldn't spin 15,000 RPM and blow up.
400 turbo trans were considered junk until they went spragless. The big issue is 1,000's of people buy 400 turbo's and race them. Only hundreds race the 727. So there is very little out there to prove the 727 can handle 2,500 HP. Where are you gonna find the diehards that want to run a 727 that can actually make that power. I think it can be done. But, I don't ,make that kinda power to prove it. Chrisman runs a blown Promod but 4.40's is not enough power to really say "Hey we have tested it to the extreme. I have seen fairly basic aftermarket parted powerglides handle that. Here is why I say this. There are many Pro flites that are using modified stock 904 parts running behind engines making over 1,000 HP and have the ET to back it up. Put the same trans behind a but kicking SS Hemi and they sometimes give up. The 727 is lightyears bigger internally and with the few aftermarket parts needed can handle 2,000HP IMO. But, there are some other parts that need upgrades to really get over and beyond that. Here is the real deal HP does not break transmissions. Torque and tire shake is what tears out transmissions. So if you have a perfect setup it is hard to tell what you can get away with.
Leon
Career best 8.02 @ 169 at 3050# and 10" tires small block power.
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Re: Why is a turbo 400 better than a 727?
[Re: hemi-itis]
#1114245
11/15/11 08:31 PM
11/15/11 08:31 PM
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Joined: Jul 2008
Posts: 30,632
Florida STAYcation
IcorkSOAK
Financed his waterbed
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Financed his waterbed
Joined: Jul 2008
Posts: 30,632
Florida STAYcation
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Quote:
I will never give up my pushbuttons  
AS HEAVY as that combo of yurrs might beeez ..  ...
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Re: Why is a turbo 400 better than a 727?
[Re: bigtimeauto]
#1114248
11/15/11 10:36 PM
11/15/11 10:36 PM
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Joined: Jan 2003
Posts: 6,001
Anoka County, MN
Leigh
master
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master
Joined: Jan 2003
Posts: 6,001
Anoka County, MN
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For the average 9 second and slower car, a torque flite in a Mopar is a no brainer. Faster that that, the gear ratios become the desired attribute. Way faster than that, and most oem type automatics are your least favorite selection. As has been proven many times, they all need the equivilent amount of $ to work. Drums, expensive converters, input shafts, gearsets, cases and on and on. They all have their problems. Is one FASTER than the other: Yes. But in a 7 round race, in a well sorted out 10.50 car, who cares? That's what shoe polish was intended for.
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Re: Why is a turbo 400 better than a 727?
[Re: WHITEDART]
#1114251
11/15/11 11:13 PM
11/15/11 11:13 PM
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Joined: Jan 2003
Posts: 4,244
Canada
Kam*Kuda
OP
master
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OP
master
Joined: Jan 2003
Posts: 4,244
Canada
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thank you for the input so far. I am looking at 850-1000 hp. (not 2000hp) STreet STrip Car Fairly heavy mostly all steel B body Procharger car I am not a tightwade but I would like to pay the price and get the correct tranny for my application once regardless if it is a gm tranny or the 727 So the technical reasons would be great
1970 Barracuda Convertible
1968 Satellite Street Strip car
1654.5 Mustang
1955 Land Rover
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Re: Why is a turbo 400 better than a 727?
[Re: WHITEDART]
#1114252
11/16/11 09:34 AM
11/16/11 09:34 AM
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Joined: Jan 2005
Posts: 4,862
the frozen wastes...
Pale_Roader
Swears too much
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Swears too much
Joined: Jan 2005
Posts: 4,862
the frozen wastes...
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Quote:
BECAUSE IT HAS A TURBO INSIDE IT .  
I actually had something relevant to add, but this post renders the entire thread moot. So simple... so brilliant! hahahah
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Re: Why is a turbo 400 better than a 727?
[Re: Kam*Kuda]
#1114253
11/16/11 09:49 AM
11/16/11 09:49 AM
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Joined: Jan 2003
Posts: 13,581
Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,581
Marion, South Carolina [><]
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Quote:
thank you for the input so far.
I am looking at 850-1000 hp. (not 2000hp)
STreet STrip Car
Fairly heavy mostly all steel B body
Procharger car
I am not a tightwade but I would like to pay the price and get the correct tranny for my application once
regardless if it is a gm tranny or the 727
So the technical reasons would be great
For your application, I think a well built 727 will be just fine. I have one in my 850 hp street car that weighs 3800#. I did grenade the stock drum after 2 years of abuse, but that was about 3 years ago. It's been flawless since w/ the new billet drum.
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 4 speed, Dana 60
'71 Demon 340, no drivetrain, on blocks behind the barn
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
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Re: Why is a turbo 400 better than a 727?
[Re: an8sec70cuda]
#1114254
11/16/11 10:37 AM
11/16/11 10:37 AM
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Joined: Jan 2003
Posts: 4,283
Shelby Twp. Mi
HardcoreB
master
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master
Joined: Jan 2003
Posts: 4,283
Shelby Twp. Mi
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Quote:
For your application, I think a well built 727 will be just fine. I have one in my 850 hp street car that weighs 3800#. I did grenade the stock drum after 2 years of abuse, but that was about 3 years ago. It's been flawless since w/ the new billet drum.
Chip, Did you buy the billet steel one or billet aluminium?OR??? Care to speculate if you saw any difference in performance?
Thanks, Sean
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Re: Why is a turbo 400 better than a 727?
[Re: HardcoreB]
#1114255
11/16/11 10:44 AM
11/16/11 10:44 AM
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Joined: Jan 2003
Posts: 13,581
Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,581
Marion, South Carolina [><]
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Quote:
Quote:
For your application, I think a well built 727 will be just fine. I have one in my 850 hp street car that weighs 3800#. I did grenade the stock drum after 2 years of abuse, but that was about 3 years ago. It's been flawless since w/ the new billet drum.
Chip, Did you buy the billet steel one or billet aluminium?OR??? Care to speculate if you saw any difference in performance?
Thanks, Sean
I got the A&A billet steel drum since I still street drive it a lot. If anything, it may have slowed the car down a little bit, but not much. It's hard to tell though since the motor has a lot of runs on it.
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 4 speed, Dana 60
'71 Demon 340, no drivetrain, on blocks behind the barn
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
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Re: Why is a turbo 400 better than a 727?
[Re: Kam*Kuda]
#1114256
11/16/11 10:47 AM
11/16/11 10:47 AM
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Joined: Apr 2004
Posts: 12,339
somwhere
smokinwoody
I Live Here
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I Live Here
Joined: Apr 2004
Posts: 12,339
somwhere
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I have a CRT built 727...it has the billet steel drum and all the other goodies..I believe its John's Super pro II trans with a trans brake..he built it for me about 6 or so years ago... I think it goes for $3,500.. and then add in the converter that will range anywhere from $850-$1,000 or have a custom built 2 piece one built for $2,500.. https://www.coperacingtrans.com/product_...e93e95960793c60and he has another one..super pro III thats about $4,000... all good stuff 
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Re: Why is a turbo 400 better than a 727?
[Re: gregsdart]
#1114258
11/16/11 01:31 PM
11/16/11 01:31 PM
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Joined: May 2004
Posts: 12,505
Taxes & Virus's R-US, NY
Dragula
I Live Here
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I Live Here
Joined: May 2004
Posts: 12,505
Taxes & Virus's R-US, NY
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Years ago, the 727 never held up well on a trans brake. Guys who ran weekly and made as many as 6 or more passes a night on it needed it to last on the trans brake, and the T400 does that. Now with that said, jump ahead to present day, and there are some good parts out there for the 727 these days. No trans will be maintenance free at those Hp levels, and not with the kind of torque and weight your talking about. I would still go Lenco, and seems your in the ball park...
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Re: Why is a turbo 400 better than a 727?
[Re: gregsdart]
#1114259
11/16/11 01:40 PM
11/16/11 01:40 PM
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Joined: Oct 2006
Posts: 4,590
Indy
joshking440
Lunch is on me!
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Lunch is on me!
Joined: Oct 2006
Posts: 4,590
Indy
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Quote:
Quote:
Quote:
if you say you will NEVER put a GM trans in your mopar, than you are never going to have a fast mopar...
"fast" must mean in the low sevens.
Fast means low 8s or better....and lets not forget we all fight the same issue that tears up our stuff...weight.....my car is 3675....thats hard on everything
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Re: Why is a turbo 400 better than a 727?
[Re: Dragula]
#1114260
11/16/11 01:44 PM
11/16/11 01:44 PM
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Joined: Jun 2007
Posts: 2,646
Plymouth Meeting, PA
bigtimeauto
Trophy Winner
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Trophy Winner
Joined: Jun 2007
Posts: 2,646
Plymouth Meeting, PA
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how about the turbo 400 has better converter choices? I couldn't even get a converter for my car with the 727 unless i made some concessions.
As for the intermediate aluminum drum your not going to see it in the et but it will put less strain on the clutch pack on the 1-2 shift when that drum has to stop spinning. I don't know how much power your car makes but a pretty much stock pre 1968 turbo 400 will live thru 1200 hp no problems (as long as its a quality rebuild with the correct clearences and clutches). All of the *built* ones just have the bigger sprag and drum the earlir ones had. Also if your going to use a ultra bell on the front of it you need to find a 8 bolt pump case/core to build your trans.
After 12-1500 hp you can buy the good shafts and drums but you still will be cheaper than a lenco anything except the cool factor.
BB, TT5,Procharged 3300lb Street Car 4.79/154
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Re: Why is a turbo 400 better than a 727?
[Re: bigtimeauto]
#1114264
11/16/11 03:21 PM
11/16/11 03:21 PM
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Joined: Jun 2008
Posts: 577
Arkansas
Adrielp
mopar
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mopar
Joined: Jun 2008
Posts: 577
Arkansas
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My question is, how do they get the chrysler transmissions to hold good power in comp eliminator? Lots of engines over there are in 1000-1200HP range. Also, in that same case, they perfect their converters so why are they not limited? Lots of them are being used in gm and chrysler applications
Adriel Paradise
Substation Design Engineer III
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Re: Why is a turbo 400 better than a 727?
[Re: Adrielp]
#1114265
11/16/11 03:53 PM
11/16/11 03:53 PM
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Joined: Dec 2009
Posts: 21,299
in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
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Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 21,299
in a cattle trailer down by th...
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Quote:
My question is, how do they get the chrysler transmissions to hold good power in comp eliminator? Lots of engines over there are in 1000-1200HP range. Also, in that same case, they perfect their converters so why are they not limited? Lots of them are being used in gm and chrysler applications
With a thick midplate you could probably get any converter you want to fit in there. Those Comp trannies use a thick spacer for an adapter.
"Come get your wife"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Front and rear disc and hydroboost conversion.
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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Re: Why is a turbo 400 better than a 727?
[Re: Adrielp]
#1114271
11/16/11 09:36 PM
11/16/11 09:36 PM
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Joined: Feb 2004
Posts: 1,093
Long Beach, CA
Mike Swann
super stock
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super stock
Joined: Feb 2004
Posts: 1,093
Long Beach, CA
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Quote:
My question is, how do they get the chrysler transmissions to hold good power in comp eliminator? Lots of engines over there are in 1000-1200HP range. Also, in that same case, they perfect their converters so why are they not limited? Lots of them are being used in gm and chrysler applications
3 words; Dave Smith Protrans.
I am about ready to start a 2300HP TF with him. Why? because the last trans I bought from him has 600 runs on it, one rebuilt, clutches only. This is with 1000 ft-lbs of torque, going in. I can tell when its time to rebuild by the 1/2 shift data trace.
Putting it another way, how many of you guys get your 10 inch superduty converter stall speed to 7500 rpm?
8.30's @3400 lbs
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Re: Why is a turbo 400 better than a 727?
[Re: turbobitt]
#1114272
11/20/11 12:21 PM
11/20/11 12:21 PM
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Joined: Aug 2010
Posts: 167
mi
dirty magnum
member
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member
Joined: Aug 2010
Posts: 167
mi
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Quote:
To bullet prof a TH400, your looking at a direct drum with super sprag $680, plus billet input shaft $300, plus all the other normal expense.
Almost forgot about billet intermediate shaft $230. Just as expensive I think...
Allan G.
you only need to change the sprag in a turbo 400 and it will handle 1000hp and live on the street.
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Re: WHy is a turbo 4oo better than a 727?
[Re: HEMIFRED]
#1114274
11/20/11 01:37 PM
11/20/11 01:37 PM
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Joined: Feb 2006
Posts: 698
Alberta Canada
Edge
mopar
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mopar
Joined: Feb 2006
Posts: 698
Alberta Canada
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yesterday's news or should we say racing transmisson now it's as P/G with a lock up converter is replacing Lenco and Bruno drives. Huges and ATI both have a version can hold 3,000 hp snd much lighter than Lenco Quote:
Not so sure the Lenco is yesterdays racing transmission quite yet. True the new PG's are lighter (my 4 speed lencodrive is very heavy) and have recently been upgraded to handle more Hp, but in my opinion it is not Hp that breaks transmissions it is torque and tire shake, While some of the nitrous car are changing I am not aware of that the supercharged cars have made the move away from the Lenco atleast at this point in time. But I could be wrong. Regardless it is impressive how much power these new generation glides/400's can handle.
Back to the main subject regarding the 727, as stated above a good strong transmission can be built but the availability of different gear sets is real limitation for higher hp applications.
76 Duster
work in progress
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Re: Why is a turbo 400 better than a 727?
[Re: Kam*Kuda]
#1114277
11/20/11 08:41 PM
11/20/11 08:41 PM
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Joined: Aug 2003
Posts: 43,986
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,986
Bend,OR USA
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Last edited by Cab_Burge; 11/20/11 08:43 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Why is a turbo 400 better than a 727?
[Re: hemigod426]
#1114278
11/20/11 08:54 PM
11/20/11 08:54 PM
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Joined: Jan 2003
Posts: 4,244
Canada
Kam*Kuda
OP
master
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OP
master
Joined: Jan 2003
Posts: 4,244
Canada
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Quote:
Quote:
I see many high horsepower cars using a turbo 400 with lots of luck.
What are the internal workings that allow a 400 to be upgraded and work well.
Where are the weak points in the 727 or 400?
looking at 850-1000hp street strip car.
seams like the new hot setup is powerglide with gear vendors overdrive,many fox body and newer mustangs run then with out fail, with sick 8-9 second 1/4 miles passes on real street cars with turbos or chargers 800-1200 hp
Interesting option....
http://www.gearvendors.com/racing.html
Quote:
DRAG RACING Powerglide
The GEAR VENDORS in combination with the Powerglide is an affordable, reliable, and very efficient package. This is a superior alternative for most cars thinking of going to a Th400. The GEAR VENDORS .78 to 1 ratio allows you to go to a numerically higher rear gear to improve your 60ft. times and get it all back with the overdrive. The reciprocal of our ratio is 1.28 so a car that currently runs a 4.56 rear could go to a 5.84 without loss of top end. You will have these improvements with reduced cost, greater reliability, and lower parasitic losses when compared to 3-speeds. Using a lower rear end ratio also lets you keep a close ratio spread on your glide for more power at the 1-2 shift. Many cars with 1200hp or less will also find benefit in using 1st-over which will net a really nice 4spd spread of 1.76, 1.33, 1.00, 0.78. or 1.82, 1.41, 1.00, .78
The overdrive is switched on with 12-volts and so is easily adapted to steering wheel buttons or automated through our AutoShift sequencer or rpm switches. The product is ideally suited in stock form for cars with 1200hp or less and in this case is virtually indestructible, literally running for seasons of use without maintenance other than fluid. Cars with more than 1200+ horsepower can be accommodated but you should call the factory so hydraulic issues dealing with clutch ramp timing can be properly adjusted for your application weight and hp.
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Re: Why is a turbo 400 better than a 727?
[Re: Steve1118]
#1114280
11/20/11 11:18 PM
11/20/11 11:18 PM
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Joined: Jan 2003
Posts: 4,244
Canada
Kam*Kuda
OP
master
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OP
master
Joined: Jan 2003
Posts: 4,244
Canada
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Quote:
.....not this again.... 
Not sure what you are talking about??
but thanks for your input
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Re: Why is a turbo 400 better than a 727?
[Re: Mike Swann]
#1114281
11/20/11 11:42 PM
11/20/11 11:42 PM
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Joined: Dec 2006
Posts: 3,667
Arizona
Chris'sBarracuda
master
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master
Joined: Dec 2006
Posts: 3,667
Arizona
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Quote:
Quote:
My question is, how do they get the chrysler transmissions to hold good power in comp eliminator? Lots of engines over there are in 1000-1200HP range. Also, in that same case, they perfect their converters so why are they not limited? Lots of them are being used in gm and chrysler applications
3 words; Dave Smith Protrans.
I am about ready to start a 2300HP TF with him. Why? because the last trans I bought from him has 600 runs on it, one rebuilt, clutches only. This is with 1000 ft-lbs of torque, going in. I can tell when its time to rebuild by the 1/2 shift data trace.
Putting it another way, how many of you guys get your 10 inch superduty converter stall speed to 7500 rpm?
Chris.. 
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before he calls you back, it is worth the wait if you want the best parts out there 
