I don't know how to do it on FWD cars, I only know how to do it on older RWD vehicles. But I can look into it for you. I don't know if there's a way to do it on a TH440.....You could also look on ebay to see if there's any TH 440 performance parts on ebay. You can build a killer trans for a descent price, that's where I got the parts to build my trans for my truck

i wouldnt screw with the TC. IT works that way for a really good reason. Go to howstuffworks.com and look up how an auto transmission and TC work, that will fill you in.

I went through a little quest one day and did a search here for all the little tips and tricks ppl have used on the 4T60 (non elec... ) as an idea for ways to up the shifts and abuse handling better. I found some neat little things

- COOLER (duh...)

- aftermarket HD adjustable vac modulator (these also allow you to adjust your WOT mph shift points along with some line pressure adjustment etc)


- adding urethane sway bar bushings in with the accumulator springs

- B&M trick shift <--- extreme differing opinions on this

- aftermarket servo rebuild kits ( these are "fixes" but they are a little larger.. which can help)

- HD aftermarket clutch pack rebuilds

also... one thing I'm going to look at is talking to a performance aftermarket trans specialist shop about some custom work to the valve body aseembly itself, and their opinion on drilling passages and such ( aka like an off the shelf shift kit)

unfortuneatly the 4t60 is in "no mans land" as for performance and you gonna have to look at mostly custom stuff

I have a lot of searching to do.. first of which is a job interview I have tomorrow. Maybe I can earn some money to actually pay for the crap I need!

Anyways, I have some plans for something that will remain a secret, until I actually have funding for this project.. and I will probably be looking at 250/325 hp/tq. This will be a far off hope, however if I take the time to fix up my tranny, I want it to be able to handle that kind of power, without worry.

I didn't know the vacuum modulator controlled shift points? I believe the 4T60-E modulator works in the 4T60[hydraulic], and the -E's modulator is adjusable.. but I don't know what kind of adjustments.

I understand what all the other's are [thanks to some looking up in the FSM], except the drlling of holes in the valve body. Why would you want to do that?


-justin

My modulator was not working properly. I think it was partially because the modulator is original to the car, and has rust on it, so I doubt it operates fully, and two, the vacuum line going to it, was disconnected, thanks to a broken vacuum distrobution block nipple. My shifts were fine, however I had 2nd gear starts.. and I didn't like that. Not to mention the harsh, HARSH shifts when cold. Before I turn the key, after my little top end rebuild, my tranny is getting a good ol' flush, and this vacuum modulator junk is just all going to be replaced.


-justin

Shifts being hard as a rock.. like good 'n firm, or beyond harsh?


-justin