What do you put behind that big engine?
Postmaster
Joined: Jun 2005
Posts: 2,656
Likes: 1
I found this .....HEAR SAY...............
Just in case you're curious, power loss for various auto transmissions:
Please remember these are approximate values, and were provided by Car Craft Magazine.
Powerglide_____18 hp
TH-350________36 hp
TH-400________44 hp
Ford_C-6______55-60 hp
Ford_C-4______28 hp
Ford_FMX______25 hp
Chrysler_A904__25 hp
Chrysler_727___45 hp
Just in case you're curious, power loss for various auto transmissions:
Please remember these are approximate values, and were provided by Car Craft Magazine.
Powerglide_____18 hp
TH-350________36 hp
TH-400________44 hp
Ford_C-6______55-60 hp
Ford_C-4______28 hp
Ford_FMX______25 hp
Chrysler_A904__25 hp
Chrysler_727___45 hp
Moderator
Joined: Jun 2003
Posts: 3,547
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From: Calhoun GA
Me personally, I wouldn't choose a transmission solely on it's weight and parasitic loss. A C4 can most certainly be built to withstand a good bit of torque. But a C6, with the same upgrades, will be able to handle even more...and stronger means a longer life and more passes down the strip. Given the above mentioned application, that's the one I would choose to bolt to that 557 stroker.
Tuned
Joined: Apr 2001
Posts: 491
Likes: 0
From: Newbury NH
Super Moderator
Joined: Apr 2004
Posts: 34,491
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Why be stuck in the 1930s with a 3 speed?
They sell one good for 750 horse:
http://www.transmissioncenter.net/AOD.htm
Scroll down just over half way and they sell an adaptor for the AOD to bolt to a 460 block. Note wider ratios available.
This guy claims "stage 2" good for 850 ft/lbs...
http://ckperformance.com/ford_aod.html
GM 4L80, good, in "stage 2, for 1000 hp:
http://www.ckperformance.com/resourc...SMISSIONS.html
But I can't find an adaptor to a 460 block.
They sell one good for 750 horse:
http://www.transmissioncenter.net/AOD.htm
Scroll down just over half way and they sell an adaptor for the AOD to bolt to a 460 block. Note wider ratios available.
This guy claims "stage 2" good for 850 ft/lbs...
http://ckperformance.com/ford_aod.html
GM 4L80, good, in "stage 2, for 1000 hp:
http://www.ckperformance.com/resourc...SMISSIONS.html
But I can't find an adaptor to a 460 block.
Elder User
Joined: Feb 2006
Posts: 833
Likes: 0
I would have to base my opinion on the purpose of the truck. If you are racing go with the glide. It has a higher first gear ratio which if matched properly with your rear gears will help tire spin provided there is enough torque to launch the truck. If on the street I would try to find an OD trans, however keep in mind they usually have a lower first gear. Or my favorite a TKO600 5spd manual trans.
Senior User
Joined: Sep 1999
Posts: 180
Likes: 0
From: Calderwood
I don't know, Gregs had good luck with the C4 in his Galaxy, it's a heavy car running high 9s.
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Posting Guru
Joined: May 2007
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From: North Reading Mass
A&P refers to Airframe and Powerplant certification for aircraft mechanics. The one I know is a great auto mechanic too.
The bigger trans do eat more hp turning bigger internals but they tend to last longer with big hp engines. I had two suburbans, one with T-350 and the other with a TH-400. Both had the same rear ratio and 350 4bbls. They were different but power seemed the same. The TH-350 did get about 1 mpg better on the highway and 2 mpg around town but other factors could be responsible. The 400 went to 175k and was still working when I sold the truck. The 350 had about 140k was starting to show signs of failure then. The C-6, TF-727, and TH-400 are strong trannies and will last a long time if kept clean and cool.
The bigger trans do eat more hp turning bigger internals but they tend to last longer with big hp engines. I had two suburbans, one with T-350 and the other with a TH-400. Both had the same rear ratio and 350 4bbls. They were different but power seemed the same. The TH-350 did get about 1 mpg better on the highway and 2 mpg around town but other factors could be responsible. The 400 went to 175k and was still working when I sold the truck. The 350 had about 140k was starting to show signs of failure then. The C-6, TF-727, and TH-400 are strong trannies and will last a long time if kept clean and cool.
Fleet Mechanic
Joined: May 2005
Posts: 1,575
Likes: 11
From: Puyallup, WA
Almost every, but I can't say, engines that I have been involved with on the dyno always produce less horespower than what the owner figures.
Sometimes it is the vehical set up or tune condition, sometimes the atmoshepric conditions, sometimes the transmission or the final drive ratio or even the tires. Some of these listed "reasons" are true I am sure. Other is just reality, actual dyno proven horespower can be a bit challenging. I have yet to find one person that says the C-6 takes 60hp, so that may just be something circulating on the net.
Personally behind that big engine I would run nothing less than a built C-6. If you do decide to run a C-4 make sure you get a scatter blanket, you don't want to hurt yourself when it lests go. A scatter blanket might not be a bad idea on the C-6 if you get on it hard a lot. Saves the pain of recovery, and at worst the loss of any precious body parts!
My two cents - David
Sometimes it is the vehical set up or tune condition, sometimes the atmoshepric conditions, sometimes the transmission or the final drive ratio or even the tires. Some of these listed "reasons" are true I am sure. Other is just reality, actual dyno proven horespower can be a bit challenging. I have yet to find one person that says the C-6 takes 60hp, so that may just be something circulating on the net.
Personally behind that big engine I would run nothing less than a built C-6. If you do decide to run a C-4 make sure you get a scatter blanket, you don't want to hurt yourself when it lests go. A scatter blanket might not be a bad idea on the C-6 if you get on it hard a lot. Saves the pain of recovery, and at worst the loss of any precious body parts!
My two cents - David
Thread Starter
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Senior User
Joined: Mar 2004
Posts: 161
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From: Wherever there's danger..
Outstanding help, everyone. I'm going to stick with the C-6 but I am going to beef it up a bit. I want this truck to dominate on the track but still be somewhat streetable. If I can't hop in it and hit the Saturday night rod-runs, I just won't be able to enjoy it as much as I wanted when I started this build.
As for the C-6 eating up to 60rwhp...I think I have enough rwhp to spare a little.
Thanks again, everybody!
As for the C-6 eating up to 60rwhp...I think I have enough rwhp to spare a little.
Thanks again, everybody!
Postmaster
Joined: Jun 2005
Posts: 2,656
Likes: 1
check this out....
http://www.topham.kicks-***.net/C6/index.htm
I built another one and I did it without machining the shell
http://www.topham.kicks-***.net/C6/index.htm
I built another one and I did it without machining the shell
Last edited by HemiEater; Jul 1, 2007 at 11:35 AM.
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