All of General Motors’ 2015 model-year full-size SUVs are set to receive interim model year updates. We’ve already given you the rundown on the updated 2015i Chevrolet Suburban and Tahoe, and now The General has applied its enhancements to the 2015 GMC Yukon Denali and Denali XL.
If you’ve been wanting to buy a 2015 Yukon Denali or Denali XL but held out, than congratulations, you’re either well-informed or very lucky. That’s because all GM vehicles with the 6.2-liter EcoTec3 V8 engine are being updated with the automaker’s new 8L90E eight-speed automatic transmission for the interim model year.
Source
GM Authority