Hi,

i have a 2000 Silverado that i changed trans fluid on at 145000
( 1st time ), afterwards truck would start in 2nd and nor shift into overdrive, took it to Aamco, they said both solenoids were bad and replaced them, they said the truck now wont shift into 3rd until warmed up, they dont know why. i decided to not have them tear into it further.
It takes about 3 miles before the truck starts to shift normally, i also tried a bottle of Lucas trans stop slip, so far no improvement...

any suggestions ?

Thx