6L80E 6L90E Output Planetary Lube Dam Sonnax Number 104584LP.
The output planetary assembly in GM 6L80 and 6L90 transmissions has a lube dam, or cover, that directs lube oil flow to the planetary lube feed passages. Over time, the lube dam allows gunk and sludge buildup, which chokes off lubrication. This commonly happens after overhaul, resulting in comebacks due to failed planetary assemblies.
To clean out the lube passages, the lube dam must be removed — which requires destroying it. By cleaning the lube passages and installing Sonnax output planetary lube dam 104584LP, you can avoid output planetary-related lube failures and comebacks.
- Lube failures
- Planetary failure
- Loss of lubrication oil to planetary
The output planetary lube dam traps contamination, blocking lube flow and resulting in comebacks.
Remove OE lube dam, flush planetary lube passages and install Sonnax output planetary lube dam.