Thread: 4t65e rebuild...

UPDATE:

I decided to just take it out on the road and run it hard and see what happened. At first, it had a few problems, mis-shifting from 1-2, slow shifting from 2-3, slipping in 2nd, just a bunch of weird stuff. After running it around town and out on the highway a bit, and climbing a few hills, everything has smoothed out nicely. 1-2 shift is smooth and quick, 2-3 is the same, ditto 3-4. Downshift is quick and solid. Even 2nd has improved greatly and is slipping only a little on a very steep hill near the house, and not at all if I hit it hard. My final diagnosis is the tranny goop. I admit, I got a little silly with it here and there. So, I think it's washing out and everything is clearing up nicely. Lesson learned...a little dab'l do ya.
In the end, if I had to make the decision to rebuild it again, I would do it. The actual re-build isn't nearly as bad as getting it out of the car and putting it back in.

I might have spoke too soon. Just ran the car to town and it set a 0742 code. TCC stuck on...???

I didn't use any on the valves themselves. I coated them with ATF as I installed them. I'm wondering if I got a bad TC or solenoid. They are both new.

Yep, I inspected all of the valves. They are the dark colored hardened valves and showed no wear at all. I used the side fine pic to try to wiggle each valve in it's bore and found zero play in every valve. I didn't replace the harness, but none of the clips broke and the harness tested fine. I tested the old solenoids by using the harness and a 12v power supply to make sure the entire circuit was good. Even though all of the solenoids clicked, I replaced them all.

In any event, I think this thing is intentionally trying to p*** me off. I got up this morning, reset the code and drove the crap out of it all over the county. My intention was to note every single thing it did/under what circumstances. I took the most punishing roads I could think of (since I live in West Virginia there's plenty to choose from). I used hilly roads, curvy roads and even went out on the interstate and cranked it up to 75mph. Brought it home via the steep hill. Not a single problem. No slipping, no TCC stuck on, no mis-shifting. It ran like it was new out of the box. Parked it and checked the fluid level, perfect.

I don't know what to think now.

We ran it all day today. It sometimes mis-shifts under heavy acceleration. For instance, approaching a hill at low speed (say 1'st or 2'nd gear) and getting down on the gas to take the hill, it will wind out (while going up the hill) unless I let off the gas. As soon as I let off the gas, it will upshift and get going. Any problems only occur when under heavy acceleration or load, such as going up a steep hill. On flat ground and normal acceleration, everything is smooth as can be. No codes have been set today. I'm thinking maybe I should have replaced the TCC control valve.
As far as changing the fluid after break in, I wasn't aware there was a break in. I was planning to replace the fluid and filter on the 11th because I didn't like the idea of having that tranny goop in the fluid. I am also considering lowering the sub-frame and replacing the TCC control valve.