I have the Lux package and the Adventure package both. You get lower gears with the Adventure package for the 33" tires. I traded in a 2003 S10 ZR2 with the 4.3 V6 engine. The H3 is NOT short on power. One engineering trick is that the transmission shifts when it should to adjust for the engines load. Really a nicely engineer match between engine and transmission.
I also have a Tahoe which was like your H2. The H3 does not perform like a 5.7 or 6.0 engine. But, I respect the H3's performance. No regrets except I think I'm going to have to purchase my wife one also.
