The 6L80 pump generates line pressure for the entire trans. When it wears, line pressure drops and the whole trans suffers. Here's the complete rebuild guide.
6L80 pump basics
The 6L80 pump:
- Belt-driven from the torque converter
- Generates 50-200 PSI line pressure (varies by conditions)
- Lubes all bearings and bushings
- Powers all shift solenoids
When pump wears: less pressure available, shifts get sloppy, components wear faster from low lube.
Common wear points
1. Rotor wear
Inner and outer rotor faces wear against pump body. Internal bypass increases. Pressure drops.
2. Pump body bushing wear
Bushings allow rotor wobble. Increases internal leakage.
3. Stator support bushing
Wear at converter-side bushing. Affects converter mounting and pressure.
4. Pump body wear
Heavy use causes wear at sealing surfaces. Causes leaks.
5. PR valve bore (some pumps)
Some 6L80 pumps integrate PR valve. Bore wear common.
When to rebuild pump
Mandatory during rebuild:
Pump should be inspected and rebuilt or replaced during every 6L80 rebuild at 150K+ miles.
Diagnostic indicators:
- Line pressure low under load
- Whining from front of trans
- Shift quality degraded
- TCC issues from low pressure
Rebuild components
Standard pump rebuild:
- All bushings
- All seals
- New gasket
- Inspect rotor (replace if needed)
HD pump rebuild:
- HD bushings
- All seals
- New gasket
- HD rotor or new rotor
- Sonnax PR valve kit if integrated
Pump replacement:
- New pump assembly
- $400-800
- Verify spec for year
Cost summary
DIY rebuild:
- Bushing kit: $40-80
- Seal kit: $30-50
- Total: $70-130
As part of trans rebuild:
- Add $50-100 for pump rebuild parts
- Same labor as rebuild
Pump replacement:
- New assembly: $400-800
- Labor: $200-400 (if standalone)
Need 6L80 pump rebuild parts? Shop our 6L80 catalog. Pump bushings, seals, rotors, complete pump assemblies. Free shipping over $70.
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