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Bolt on LT1 with TH 400???

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Old Feb 22, 2009 | 07:12 PM
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Default Bolt on LT1 with TH 400???

hey guys just a question about my trans. Im looking into swapping my M6 to TH400 RMVB, trans brake and around a 3800 stall. My car currently just has bolt ons, suspension and lots of weight reduction...in the 3k race weight range. Now the question is if i swap to a TH400 how much would that help me out? btw i will be running a 4.10 gear with 2765/60/15 ET Street Radials.

thanks in advance
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Old Feb 22, 2009 | 10:40 PM
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Odd tire size there.
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Old Feb 22, 2009 | 10:54 PM
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haha yea! wish i could fit a tire that wide, much less afford one! lol

Um are you on the stock 10-bolt? I kinda decided against a transbrake for my setup. Mainly because that it is a big jolt once you let go of the button, and if you want to find the weak point in your car that will probably show it to ya!
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Old Feb 22, 2009 | 10:56 PM
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You should have enough room to hit 120mph at the top of 3rd (6000rpm)

The 1st gear ratio should get you out of the hole GOOD.
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Old Feb 22, 2009 | 11:45 PM
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on my old cam-only LT1 set-up, i switched from a 700r4 with a 3600 stall to a th400 with rmvb and a 4500 stall and knocked off almost 2 tenths on motor and on a 150 shot. 11.90's NA and 10.90's on nitrous to 11.70's and 10.70's
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Old Feb 23, 2009 | 10:50 PM
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Originally Posted by 9sec93
on my old cam-only LT1 set-up, i switched from a 700r4 with a 3600 stall to a th400 with rmvb and a 4500 stall and knocked off almost 2 tenths on motor and on a 150 shot. 11.90's NA and 10.90's on nitrous to 11.70's and 10.70's
what cam are you running?
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Old Feb 24, 2009 | 12:30 AM
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Originally Posted by TABBED 5.3
what cam are you running?
it was a cc503.
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Old Feb 24, 2009 | 11:55 AM
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Originally Posted by 3DFORMULA
Odd tire size there.


woops..ment 275/60/15 LOL owell.

Im going to be going with either the cc306 or gm847 for my setup. So you guys think a TH400 will help me out and drop some time off my ET?
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Old Feb 24, 2009 | 12:10 PM
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Originally Posted by 3rdgen92maro
So you guys think a TH400 will help me out and drop some time off my ET?
simply put yes ....your 60 will drop massively ! i just did the same thing M6 to a TH400 but i went with a 5200 9in converter
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Old Feb 24, 2009 | 12:14 PM
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awesome thats what im looking for. i cant get my car to 60' to save my life. So what do you guys think a 4k stall?
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Old Feb 24, 2009 | 12:18 PM
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thats nothing lol....i just put a 5200 in mine
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Old Feb 24, 2009 | 12:31 PM
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i know i know lol. hey another question will the stock drive shaft work with a short tale TH400?
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Old Feb 24, 2009 | 12:36 PM
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i want to say yes you will need a drive shaft ....and 4000 stall for the street is np
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Old Feb 24, 2009 | 12:47 PM
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Originally Posted by ndfrsd6
i want to say yes you will need a drive shaft ....and 4000 stall for the street is np
damn it i was hoping i could get away with using the stock aluminum one i have....That's what i was thinking just run the 4k stall because the car will still see street duty during the summer.
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Old Feb 28, 2009 | 01:49 PM
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why such a low gear?
i know you want a whole shot, but damn. any other mods and youll run out of rpm at the end of the track
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Old Mar 1, 2009 | 10:54 AM
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I installed a th400 with 3800 converter and t-brake, that dropped my 60' from 2.20 on the 6-speed to 1.51 on the th400. Both were on the factory 10 bolt with 4.10 gears.


Also you will need another drive shaft for the install.
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Old Dec 25, 2011 | 01:04 AM
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What is needed to Convert a T56 to TH400 Trans on a 93 Trans Am LT1?

Joe
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Old Dec 25, 2011 | 03:51 AM
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I have searched high and low on this forum and others and have not found any links to this conversion. I have found plenty on the LS* to TH400 so if you guys have any actual links that you can post up for me that would be a great help. I have tried in vain with every combination of phrases that I can think of and none have worked.

Thanks,

Joe
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Old Dec 25, 2011 | 11:32 AM
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For the swap your gonna need to get a Trans, TQ Converter(Im pretty sure a standard GEN1 converter will bolt right up), Flexplate(I used a stock 4L60 for my swap), Trans Xmember(Used a bmr peice for my car), Drive shaft, shifter of your choice and a big trans cooler and a trans temp gauge is always a nice thing to have.
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Old Dec 26, 2011 | 07:52 PM
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I run a th400. you ran reuse your t56 crossmember with some simple mods. I have a nice billet protorque converter that would work well with your setup, it went 4000 or so behind a mild 383. You'll need a new driveshaft, I had a local shop build a 3" chromoly for 350 bucks.
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