Trans problem

djms

New member
Dec 25, 2006
263
0
0
Houston tx area
Need help with trans!! My truck shifts like a new one until the trans gets warm, then all I have is 3rd and reverse. I put a new nsbu switch yesterday and I still have the same problem. Please help.
 

MACKIN

Smell My Finger...
Aug 14, 2006
3,948
1
0
Connecticut
How long have you had the ATS upgrade and who did it? The transmission is going into limp mode.

You could have debris in the valvebody or a valve sticking when it gets hot. You might have to drop the pan and have a look see.