Well I finished my 4T65E rebuild of my Pontiac and it shifts fine. It's nice to have my 4th gear back also. This is what I replaced in mine.
1st & 2nd shift solenoid
new thrust washer kit
new oil pump shaft
new sungear
new front bands
replaced all seals
new steels
new clutches
new torque converter ...

Man I have to tell you that is an awesome post you have for the rebuild of the 4T65E. It actually inspired me to do my own. The only thing that was wrong with mine is I lost 4th gear and decided to go on and rebuild it. Looked real good inside but I am replacing everything from seals to solenoids to ...