85 Squarebody76
Full Access Member
- Joined
- Dec 12, 2021
- Posts
- 64
- Reaction score
- 82
- Location
- Missouri
- First Name
- Bob
- Truck Year
- 1985
- Truck Model
- GMC C1500
- Engine Size
- 305
Or a vac leak or a bad vac modulatorSounds like the detent cable needs to be adjusted (if your model has it) to get it to shift earlier.