Hello
I have a problem that has me stuck, I just completely rebuilt my 4t65e including solenoids and pressure switch, run great for 2400 miles, all of the sudden it developed a problem it will shift find until it warms up then it will start off in first rev to about 4000 rpms light throttle and shift straight to third, tcc lock and ten it shift to 4th. it will downshift with no problem 4-3-2-1. but the upshift 1-3-4. used a gm scanner no codes engine just tunned up. could it be a 1-2 solenoid? maybe a stuck 1-2 shift valve. please help!!! no slips, fluid smells and looks good. If i place it in manual 2nd it starts in first and stays there.
