So you spent all that money and didn't get a 6.2? I would have thought you'd know better after having one in your Silverado.
funny you should say that. I am not pleased with my 8 speed transmission, I know the Tahoe has the 10 speed but I am still skeptical as the 6 speed is more proven. Also with my Silverado the 6.2 tows my boat with ease, but during regular driving you would never know it has 420HP. I had to disable to AFM, put in a diablo tune and 20% throttle boost to finally make it somewhat feel like the monster motor it is. i also did the "paint stick" behind the pedal "fix" that I am sure you have hard of to help throttle response. I had a 5.3 6 speed as a loaner vehicle when my Z71 was in for work and I was very pleased with the acceleration and shifting. Dont get me wrong the 6.2 is amazing when you really get on the throttle and I enjoy towing my boat with ease, but for my wife to use as a DD, the 5.3 will be just fine in the Tahoe, as it has been for years. I do plan on the Airaid Jr intake, and a tune to remove the AFM.