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Old 12-23-2003, 02:27 AM
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Th-200-4r Mods- Please Help

I have a Th2004r and was wondering if anyone has placed spacers under the accumulator pistons or just increased the spring tension acting on those pistons. I am about to do this in hopes of speeding up the shift rates between 1-2 and 3-4 gears. Has anyone tried this an recieved adquate results?

I also want to install a hardened pump-input shaft due to the fact that I chewed off all the splines. SHould I go ahead and replace the pump with a 10-vane pump while I am at it? Are there any special reccomendations on how I should pull the pump out of the tranny? (Other than "just track down the proper GM pump-puller tool"?)

I would also like to improve the shifts (ie: make them snappier) via modifying the valve body spacer plate. Has anybody modified theirs successfully. (I mean I could go and buy the the B&M shift improver kit, but where is the fun in that?)

I would greatly appreciate any help you could give me!!! Thanx.


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Old 12-25-2003, 07:48 PM
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hey Jessie,

I have a built 200 4r in my '55, and I am very happy with it. From what I have learned on these trannies, the hardened input shaft is the way to go, but it is a very hard part to find.

There is more to it than shimming the spring. The clutch packs and internals might have looser tolerances as time goes on. As far as shift points go, make sure you have the correct govenor and speedo gear for the car. If either one of these items is incorrect, your points will be way off like mine. I gave up trying to find a Buick govenor for cheap, so I just bang through them manually.

Lastly, it is super important (you might know this already) that the TV cable is properly set. The only way to do it is with the gage. I gave up trying to build a 200, so I went to bow tie overdrives and it was the best 1200 bucks I have spent to date. It has all the go fast goodies built in, ready for abuse.

my second gear looks like:


good luck!

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Old 12-25-2003, 11:03 PM
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I would recomend the TransGo kit for the 2004r. You will be glad you used it.

To remove the pump , make sure you pull the pan and the lockup solenoid first.
Dont worry how old you are... it is the mileage on your body that adds up.
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