Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSGMC1991JIMMY 5.7 K, AUTOMATIC, 4L60/MD8REPAIR AND DIAGNOSIS (SINGLE PAGE)TRANSMISSIONAUTOMATIC TRANSAUTOMATIC TRANSMISSION - OVERHAUL - 4L80-E
1991 GMC Jimmy 5.7 K, Automatic, 4L60/MD8
Automatic Transmission - Overhaul - 4L80-E
1991 GMC Jimmy 5.7 K, Automatic, 4L60/MD8SECTION Automatic Transmission - Overhaul - 4L80-E
- Application
- Identification
- Description
- Lubrication
- Adjustments
- On-Vehicle Service
- Trouble Shooting
- Notes
- Quick Check
- Symptom Diagnosis
- Notes
- Oil Out Of Vent Or Foaming
- Transmission Overheats
- Reduced Internal Lubricant
- High Or Low Line Pressure
- Loss Of Drive
- Forward Motion In "N"
- Engine Stall
- No Torque In Reverse & 3rd
- Locked In Park
- Vehicle Moves In Park
- Slips In Reverse
- No Reverse
- Slips In "D"
- No 1st Gear In "D4"
- No 1st Gear In "D2" Or "D3"
- No 1st Gear In "D1"
- No 1-2 Shift (1st Gear Only) In "D4"
- 1st & 2nd Gear Only
- 1st & 4th Gear Only (Manual 2nd & 3rd Only)
- Late 1-2 Shift
- No Overrun Braking In "D2"
- No Engine Braking
- No 2nd Gear
- 2nd Gear Only
- No Torque In 2nd
- 2nd Gear Starts
- No 2nd Gear Braking In "D2"
- No 1st Gear In "D3"
- No 2nd Gear In "D3"
- No 3rd Gear In "D3"
- Starts In 3rd Gear
- No Engine Braking In "D3"
- 2nd & 3rd Gear Only
- No 4th Gear
- 4th Gear Starts
- Wrong Shift Points
- Harsh Shifts
- Harsh Shifts ("D" To "R")
- Harsh Shifts (3-4 Shift)
- Harsh Shifts (4-3 Shift)
- Harsh Shifts ("D4"-"D3" Or "D2" Or "D1")
- Soft Shifts
- Soft Shift (Into "R")
- Soft Shift (R To "D")
- Soft Shift (2-1)
- Soft Shift (2-3)
- Soft Shift (3-2)
- Soft Shift ("D3" To "D2")
- No "D2" To "D1" Shift
- No "D3" To "D2" Shift
- No Converter Clutch Apply
- Converter Clutch Does Not Release
- Converter TCC Apply Soft Or Slipping
- Converter Clutch Apply Time Wrong
- Electronic Self-Diagnostics
- Testing
- Removal & Installation
- Transmission Disassembly
- Component Disassembly & Reassembly
- Transmission Reassembly
- Torque Specifications
- Wiring Diagrams
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.