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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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