Having problems with your 1992 GMC Sierra ?
Gmc 2500 it will not shift into 3rdwhen i am driving it will work fine in 1st and 2nd but thats it
Change the throtle position sensor i had the same problem and it fixed it Dan
3RD & 4th shift solenoid is bad inside the transmission
Repair Help & Product Troubleshooting for 1992 GMC Sierra
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