6L80 6 speed, guaranteed For sale: Denali gearbox, 2009, 6 speed, without 4WD. 6L80E Guaranteed, and the car has only driven 170,000 km. It is currently installed on the car for anyone who wants to come and test it. Welcome. Gear oil and additive changed at SLR garage at 155,000 km. The reason for removal is that I am installing its engine on another car and will sell the rest of the parts. It fits, I believe, Sierra, Silverado, Yukon, Tahoe, Avalanche, and other similar cars. Location: Riyadh, Qurtubah. #Yukon_gearbox #Tahoe_gearbox #GMC_gearbox #Sierra_gearbox #Silverado_gearbox #Denali_gearbox