Won't downshift like when passing or like going 60 then slow to 10 and it stays in hi gear?
Lance
It won't downshift when slowing down to a stop. When I try to take off again it is still in high gear...it is "bogged down". Sometimes I manually put it into first or second gear to get it to take off right.
Just a guess but maybe your TCC (Torque converter clutch) is staying engaged. This is controled by the PCM (powertrain control module). That's about all I know, probably not a driveway fix, time for a specialist.
1999 silverado transmission not downshifting
