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The 6L90 is the heavy-duty 6L80 — same architecture, beefier hardware, higher torque capacity. Same friction sensitivity to fluid quality. Rebuild kits cross over with care.
Years
2007-present
Fits
GM HD trucks, Express vans, Suburban
Parts In Stock
Full catalog at Gearbox Insider
Ship Time
Same-day before 2pm ET
Common 6L90 Failures & Fixes
Use this as a starting point for diagnosis. Click through to the specific part once you've narrowed it down.
| Symptom | Most Likely Fix |
|---|---|
| Slipping under load | friction module |
| TCC engagement issues | TCC solenoid |
| Pump leak | pump rebuild kit |
What's In the 6L90 Catalog
The full Sonnax-grade aftermarket and OE-equivalent catalog for the 6L90 family is on Gearbox Insider. That's where the inventory lives, ships from, and updates in real-time.
- Master rebuild kits (gaskets, seals, friction modules)
- Valve body kits (Sonnax)
- Solenoid sets (shift, EPC, TCC)
- Speed sensors (ISS & OSS)
- Clutch packs & bands
- Pumps, drums, planets, sprags
- Pressure regulator & boost valve kits
- Bushings, bearings, thrust washers
Why Buy From Us
Spec parts
not "compatible"
not "compatible"
Ship before
2pm Eastern
2pm Eastern
Shipping
no minimum
no minimum
Built by & for
transmission pros
transmission pros
Related Guides
Diagnostic and rebuild guides for the 6L90 on Gearbox Insider:
Need It Today?
Same-day ship before 2pm Eastern. Order now, on your bench tomorrow.
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