1991
Junior Member
- Joined
- Mar 29, 2026
- Posts
- 1
- Reaction score
- 0
- Location
- Yukon
- First Name
- Lane
- Truck Year
- 1991
- Truck Model
- V2500
- Engine Size
- 5.7
Hi,
I have a 1991 Chevrolet V2500 suburban with a 350 and factory 4l80e. Everything runs and shifts fine but sometimes when I restart the truck, the transmission doesn't shift properly. It stays in first gear for a long time and went harsh into second. That works until 3rd gear. Reverse works fine.
After a couple restarts it works as it should. I'm pretty sure that is an electronic issue but I don't know where to look anymore.
I replaced already
Internal wiring harness 4l80e
TPS sensor
Ignition switch
Map sensor.
Checked all grounds and fuse. I have power coming to the transmission.
Speedometer works fine
Any ideas?
I have a 1991 Chevrolet V2500 suburban with a 350 and factory 4l80e. Everything runs and shifts fine but sometimes when I restart the truck, the transmission doesn't shift properly. It stays in first gear for a long time and went harsh into second. That works until 3rd gear. Reverse works fine.
After a couple restarts it works as it should. I'm pretty sure that is an electronic issue but I don't know where to look anymore.
I replaced already
Internal wiring harness 4l80e
TPS sensor
Ignition switch
Map sensor.
Checked all grounds and fuse. I have power coming to the transmission.
Speedometer works fine
Any ideas?
