transmission upgrade (4R70W)

[rs2k]

What can I do to a stock 4R70W so it'll handle 400 HP and 500 ft-lbs of torque and towing. I'd also like quicker and firmer shifts (Do a J-mod?).


I guess technically the stock transmission can handle that kind of power, but will it be reliable?


I'm planning on doing the work myself. I've never rebuilt an automatic but I did open up my 4R70W's valve body to replace a bad 2-1 accumulator. I don't think it'll be anything I can't handle.

 

[Dono]

An sct programmer, and some tuning will firm up the shifts. You won't even need to go in. To the trans.

Vroomzoomboom has a shift kit, and the shifts are....umm....I would say...aggressive. The tires bark going from 1st to 2nd under normal driving conditions

 

[rs2k]

Oh, interesting, I thought most of the shifting was done hydraulically with the 4R70W since it's the W instead of E.

What kind of programmer would you recommend?


The Vroomzoomboom sounds much to aggressive for my taste. This is my daily driver an tow vehicle after all.

I do want something firmer though. The current shifts at full throttle make give me the same feeling finger nails on a chalk board do... adding a trailer and listing it to shift under full throttle is even worse..

 

[Dono]

James at Hensonperformance tunes the transmits on also when he does engine tuning. One thing he does via the computer is increase line pressure in the trans.