1990 GMC 1500 Pickup Q&A
1990 GMC 1500 Pickup Question: Shifting problem
your transmission filter is plug up. it will cause the engine to heat up, as the tranny is running hot and slipping,hope the disc are'nt burn. pull the tranny dip stick,if it smells really bad,it might be too late.do not have it back flush,it screwed my tranny up. you need to remove the pan and clean the bottom and inside,replace the filter ,refill with new atf,run engine and top it off. good luck - Joseph GMC
Shifts to park fine, shifts to reverse fine, backup lights illuminate but doesn't engage gear. Shifts to Overdrive and second fine, will not physically shift to first. Hesitates to auto shift gears...
when shifted out of second gear runs fine then u let off the gas and it gets back to second gear its starts cuting out and back fires
when brake lite on dash comes on transmission will not shift if and when lite on dash goes off transmission shifts fine.brake booster seems to be leaking.
this afternoon went out @ NOW WONT SHIFT INTO 4 wweel,lights dont come on. shifter feels like its enguaging but no 4 wheel
New tranny trying to figure out why its not shifting to 2nd and so on no more money to pay to fix gotta fix myself was told to test srlenoids