So, I got my '95 Z28 back with the rebuilt 4L60E and the guy noticed it had a '93 valve body, so, he replaced that as well. Got it back and it ran beautifully for about a week or so. Then all of a sudden, tonight, it decided it wants to shift at 3000 RPM every gear. Well, I only got into "3rd". What in the **** could cause this ****?

 

I can't help you with what's wrong with it. But I'd definately be bringing it back to the guy that worked on it. Maybe he just forgot something. At any rate it's his wrong.

 

Well, he told me why. He said if something got hot then it would cause it to shift irregularly. I forgot exactly what, but we were working on the A/C and **** and the car was just sitting there while it was raining with the front of the car inside the building. It ran fine today though.