I hate to ruin the fun and say something simple that most people already know, but that's a GMC, not a Chevy. I know they're technically the same, but still. That thing sounds mean though.
That Jeep does NOT sound healthy in ANY Means. xD And I know you don't have a cammed out motor under the hood to make it run that way, cause you wouldn't invest in such motor work without some sort of really big tires and better condition body. xD Good luck with the mud though. Sweet trucks