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Re: Overdrive Feedback [Re: Grizzly] #2677291
07/14/19 09:50 AM
07/14/19 09:50 AM
Joined: Jan 2005
Posts: 2,447
USA, MI
MarkM Offline
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USA, MI
Originally Posted by Grizzly
Originally Posted by moparx
since an A500 was mentioned behind a 383, how much HP and torque can one of those handle, and what was used to adapt the A500 to a big block ?
beer


No problem:

http://smrtrans.tripod.com/smrtransmissionsintro/index.html

One of the Mopar magazines did a favorable article on these Guys.

I would definitely go 904-based transmission given the first gear ratio options and less parasitic drag.

I learned one thing quickly after owning my first 4 speed 318: the 727 is a power-sucking turd. I've had 318's and 360's with 727-based transmissions (3 speed and 4 speed od's) and they subtract a noticeable amount of horsepower. twocents


I had one of those SMR adapters I bought off of Craigslist that I was going to use to mate a 400 to a 518. It involves lopping of a section of the block where to the starter bolts. No going back. Went with an ultrabell instead and it's been great. Figured finding another 518 was easier than building another motor if it went south.

Re: Overdrive Feedback [Re: MarkM] #2677559
07/15/19 09:37 AM
07/15/19 09:37 AM
Joined: Sep 2003
Posts: 11,980
north of coder
moparx Offline
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north of coder
that's an interesting note. work
beer

Re: Overdrive Feedback [Re: moparx] #2677639
07/15/19 12:22 PM
07/15/19 12:22 PM
Joined: Aug 2008
Posts: 839
Texas, USA
ChrgrCuda Offline OP
super stock
ChrgrCuda  Offline OP
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Posts: 839
Texas, USA
Thanks for the very informative replies everyone!


68 Cuda Notchback [Email]10.86@120[/Email] 69 Charger R/T 440/505 2009 Challenger SRT8
Re: Overdrive Feedback [Re: ChrgrCuda] #2677650
07/15/19 12:40 PM
07/15/19 12:40 PM
Joined: Oct 2007
Posts: 3,354
New York
polyspheric Offline
master
polyspheric  Offline
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New York
I keep making the same mistake!


Boffin Emeritus
Re: Overdrive Feedback [Re: polyspheric] #2677655
07/15/19 12:46 PM
07/15/19 12:46 PM
Joined: Aug 2008
Posts: 839
Texas, USA
ChrgrCuda Offline OP
super stock
ChrgrCuda  Offline OP
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Posts: 839
Texas, USA
Just throwing this out there, as a friend made this suggestion regarding my setup. I have a 69 Charger with a 440/512 Max Wedge Indy head engine, backed by a CRT 727 RMVB and a Dana 60 w/3.73 gears and 295/50 rear tires. I won't be drag racing the car, however would like to eventually take it on the Power Tour and long road trip here in Texas. His suggestion was to just switch over to an 8 3/4 rear end with 2.76 gears, and tighten the converter if required. I realize that I would lose a lot down low, however it blows the tires off pretty easy just about in any gear as it is. What are ya'lls thoughts? I like the simplicity, however also like my Moser 60 rear end assembly.


68 Cuda Notchback [Email]10.86@120[/Email] 69 Charger R/T 440/505 2009 Challenger SRT8
Re: Overdrive Feedback [Re: ChrgrCuda] #2677693
07/15/19 02:56 PM
07/15/19 02:56 PM
Joined: Jan 2004
Posts: 587
IL
D
Dart451 Offline
mopar
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IL
I ran a 2.76 rear gear with 700+ hp for a few years. Worked well and could still destroy the tires (28x14.5 Hoosier QTP).
I added a few more street cars to stable since then so changed the gear back to the 3.55

Re: Overdrive Feedback [Re: Dart451] #2677746
07/15/19 05:47 PM
07/15/19 05:47 PM
Joined: Jan 2003
Posts: 1,297
Houston,Tx.
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Lee446 Offline
pro stock
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Houston,Tx.
I ran the Power Tour in 97 with a 500 horse 440, 727, and a tight 10' converter with a 2.76. It took a little getting used to on the street, it was a little sluggish in normal traffic, compared to what I was used to, but man was it great at road speed! With a 28" tall tire and a 6100 rpm governer, at cruise speed if you stomped it, it would downshift and at 118 mph it would hit 3rd and that 69 RR speedo needle would just disappear !

Re: Overdrive Feedback [Re: Lee446] #2677776
07/15/19 07:38 PM
07/15/19 07:38 PM
Joined: Nov 2003
Posts: 5,136
Texas
dannysbee Offline
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Posts: 5,136
Texas
Dr. Diff was working on a 3.23 for the Dana. The 3.23 with a 28” tire is very streetable.


Getting old just means you were smarter than some and luckier than others.
Re: Overdrive Feedback [Re: dannysbee] #2677785
07/15/19 08:02 PM
07/15/19 08:02 PM
Joined: Jan 2003
Posts: 14,123
So Near, Yet So Far
topside Offline
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I can't help but wonder if there isn't a market for an affordable version of the old quick-change setup.
Like what we used in the Sprint Car; took only a few minutes to change ratios.
Make it modular, with tubes, axles & ends to accommodate different builds.

Re: Overdrive Feedback [Re: Grizzly] #2677868
07/16/19 08:27 AM
07/16/19 08:27 AM
Joined: Dec 2009
Posts: 10,966
in a cattle trailer down by th...
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Guitar Jones Online laugh2
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Originally Posted by Grizzly
Originally Posted by moparx
since an A500 was mentioned behind a 383, how much HP and torque can one of those handle, and what was used to adapt the A500 to a big block ?
beer


No problem:

http://smrtrans.tripod.com/smrtransmissionsintro/index.html

One of the Mopar magazines did a favorable article on these Guys.

I would definitely go 904-based transmission given the first gear ratio options and less parasitic drag.

I learned one thing quickly after owning my first 4 speed 318: the 727 is a power-sucking turd. I've had 318's and 360's with 727-based transmissions (3 speed and 4 speed od's) and they subtract a noticeable amount of horsepower. twocents


From my experience, the 904 is most helpful behind small cubic inch low torque engines when compared to the 727. Large cubic inch high torque engines do not really benefit that much from the swap. At least not enough for a street or bracket car.


I never learned to count my blessings, I choose instead to live inside my disasters.

The Scamp is sold, now just two old trucks and one new one.
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NP435, D44, D60 and NP205 divorced transfer case. Magnum 5.2 MPI and NV4500 coming soon.
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi!
Re: Overdrive Feedback [Re: topside] #2677914
07/16/19 11:10 AM
07/16/19 11:10 AM
Joined: Apr 2003
Posts: 2,595
Tulsa, Oklahoma
340Cuda Offline
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Tulsa, Oklahoma
Originally Posted by topside
I can't help but wonder if there isn't a market for an affordable version of the old quick-change setup.
Like what we used in the Sprint Car; took only a few minutes to change ratios.
Make it modular, with tubes, axles & ends to accommodate different builds.
Would those be noisy on a street car?

Re: Overdrive Feedback [Re: 340Cuda] #2678033
07/16/19 05:39 PM
07/16/19 05:39 PM
Joined: Jan 2003
Posts: 1,758
Northern OH
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rapom Offline
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Also would like to add that GV sells a shorter adapter version for the 727 which I would have went for if it would have been available when I installed my unit. I have a 67 Coronet with 3.55 gears and the GV unit. Works great, over 7 years running. But as others have said, it would be nice to have more of a gear reduction.

Re: Overdrive Feedback [Re: ChrgrCuda] #2678049
07/16/19 06:27 PM
07/16/19 06:27 PM
Joined: Oct 2007
Posts: 3,354
New York
polyspheric Offline
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Posts: 3,354
New York
Advantage to underdrive: the driveshaft speed remains at the pinion gear speed - low. This is always a negative factor with high cruising speed and deep overdrives: the D/S "thinks" you still have a 4.10:1 axle, and reaches its critical (safe) RPM at a lower MPH.


Boffin Emeritus
Re: Overdrive Feedback [Re: polyspheric] #2678137
07/16/19 10:34 PM
07/16/19 10:34 PM
Joined: Aug 2003
Posts: 33,779
Bend,OR USA
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Cab_Burge Offline
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Bend,OR USA
Originally Posted by polyspheric
Advantage to underdrive: the driveshaft speed remains at the pinion gear speed - low. This is always a negative factor with high cruising speed and deep overdrives: the D/S "thinks" you still have a 4.10:1 axle, and reaches its critical (safe) RPM at a lower MPH.

That be true work
That is one of the good things about a two speed rear end, I wish someone would make them for us hot rodders now luck


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Overdrive Feedback [Re: Cab_Burge] #2678277
07/17/19 11:15 AM
07/17/19 11:15 AM
Joined: Sep 2003
Posts: 11,980
north of coder
moparx Offline
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north of coder
didn't mercury have a 2spd rear in one of it's cyclone models around 1970 or so ?
i vaguely remember reading in a hot rod magazine article about that. i believe it had a red cyclone with stripes on the cover.
beer

Re: Overdrive Feedback [Re: moparx] #2678287
07/17/19 11:51 AM
07/17/19 11:51 AM
Joined: Aug 2008
Posts: 839
Texas, USA
ChrgrCuda Offline OP
super stock
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Texas, USA
I called Dr. Diff (Cass) regarding his 3.23 gear set for the Dana 60. After talking it over with him, and going with a 275/60 rear tire, this is probably my best decision. Keeping it simple. I'd love to have an overdrive and it may still happen if this doesn't satisfy my needs. But 2600 RPM's at 65 is probably good enough for the long cruises. Thanks everyone for your feedback!


68 Cuda Notchback [Email]10.86@120[/Email] 69 Charger R/T 440/505 2009 Challenger SRT8
Re: Overdrive Feedback [Re: ChrgrCuda] #2678376
07/17/19 04:45 PM
07/17/19 04:45 PM
Joined: Nov 2003
Posts: 5,136
Texas
dannysbee Offline
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Texas
I thought about an overdrive but I’m wanting performance and streetable and simple. I have had several drivers with 3.23 gears over the years. One that was most noteworthy would be a 1970 442 w-30 with auto and air. I had a h70-14 tire on it. It was a great road car and pretty peppy to boot. As long as you have reasonably quite exhaust with tail pipes I think you will be happy.


Getting old just means you were smarter than some and luckier than others.
Re: Overdrive Feedback [Re: ChrgrCuda] #2678534
07/18/19 05:49 AM
07/18/19 05:49 AM
Joined: Jan 2003
Posts: 17,778
Akron, Ohio
ProSport Offline
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ProSport  Offline
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Posts: 17,778
Akron, Ohio
I currently have a 70 Challenger with a Tremec 5 speed and I LOVE 5th gear on the highway but my last car was a 72 Duster with a big block and 3.23 gears(727 trans) . I drove it to the track on the highway, ran 10.60's and drove it home. It was a great setup but I still wished it had a 4th gear to pull.


Sassy Grass street Duster, best of 10.69 at 124 driven to the track with 3.23 gears, naturally aspirated on 93 octane.
Re: Overdrive Feedback [Re: ProSport] #2678567
07/18/19 08:01 AM
07/18/19 08:01 AM
Joined: Jan 2003
Posts: 6,443
Tulsa OK
Bad340fish Offline
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Tulsa OK
Depending on your converter and motor combo you don't want to cruise at to low of an RPM. My cruise RPM is 3000-3500 and it wouldn't be happy any lower than that due to the cam and converter. I just want overdrive so I can make that 3500RPM 70-75 instead of 60 lol.


68 Barracuda Formula S 340
Re: Overdrive Feedback [Re: Bad340fish] #2681918
07/27/19 09:58 PM
07/27/19 09:58 PM
Joined: Jan 2003
Posts: 17,778
Akron, Ohio
ProSport Offline
I Live Here
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Akron, Ohio
Wow, 3000-3500 on the highway would drive me nuts, it's all about personal preference and what you can tolerate I'm sure.
Now if I can just find my pesky driveshaft vibration at 63-73 mph with the Tremec 5 speed, I've tried pinion angle shims in both directons and even bought a new custom driveshaft, also had all 4 tire balances re-checked, still vibrates. I miss my Duster lol.

Last edited by ProSport; 07/27/19 09:59 PM.

Sassy Grass street Duster, best of 10.69 at 124 driven to the track with 3.23 gears, naturally aspirated on 93 octane.
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