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Old 05-29-2011, 12:36 PM
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T-400 Cushion Plate and shifting problems

I recently had my TH400 rebuilt with a Hughes rebuild kit. It now shifts very hard into reverse or drive from park or neutral. 1st to 2nd under hard acceleration is kinda sloppy, not as firm as I would like it and does it early, around 5200rpm. 2nd to 3rd shifts nice and firm.

I talked with the shop and they said they took out the cushion plate to give it a more firm shift. Im not wanting it shift harder from park into drive, than it does from 1st to 2nd!! How hard is it to re-install this cushion plate or should I do something else?

Also what would be the best method to firm up the 1-2nd shift? Will modifying the govenor to allow higher rpm shifts help this, or is it something totally seperate?

Thanks-Jason
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Old 06-01-2011, 09:32 PM
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Quote:
Originally Posted by Blownchevelle68
I recently had my TH400 rebuilt with a Hughes rebuild kit. It now shifts very hard into reverse or drive from park or neutral. 1st to 2nd under hard acceleration is kinda sloppy, not as firm as I would like it and does it early, around 5200rpm. 2nd to 3rd shifts nice and firm.

I talked with the shop and they said they took out the cushion plate to give it a more firm shift. Im not wanting it shift harder from park into drive, than it does from 1st to 2nd!! How hard is it to re-install this cushion plate or should I do something else?

Also what would be the best method to firm up the 1-2nd shift? Will modifying the Governor to allow higher rpm shifts help this, or is it something totally separate?

Thanks-Jason
To reinstall the Forward clutch waved or cupped Cushion plate for 1st and Direct clutch w/c Cushion plate for Reverse would require dis-assembly of the Trans. A lower Idle speed or TC with higher stall speed will soften the blow.

To firm up 1-2 shift the orifice in the Valvebody separator plate can be enlarged or 1-2 Accumulator modified/blocked or firmer spring added.

Modifying the Governor will only change the WOT shift points. A Governor Recalibration Kit is a good idea for tuning shift points. B&M and TCI etc.. make these.

Valvebody Mods etc.;
http://www.crankshaftcoalition.com/w...0_Rebuild_tech
Gov Recal.;
http://www.summitracing.com/parts/BMM-20248/
http://www.summitracing.com/parts/TCI-326500/
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