I finally figured out that what I though was the a/c acting up is the converter locking and unlocking when the a/c is on, the truck jerks while cruising in second and third. It also used to do that in 3rd gear all the time before I switched to synthetic fluid. I had it in 4 dealerships for this and they never figuered it out. Can I put a switch on the TCC harness to turn it off in city driving or does anyone make one? I have the 4L60E. Ive seen a converter switch for the 700R4.