Poping noise when on steep climbs

[Alan06SUT]

When I am on extreme climbs I hear a pop, pop, pop noise when I throttle up the hill. The CV shafts are fine, tie rods are fine, the T case may be screwed, but I want to know if I have more than one problem when I take it in next week. It still makes it up the hills (locker), but the sound seems to only come from the driver's side. Thats why I don't think its part of the T case issue.

The dealer thought the popping was a bent tie rod and it was replaced but since then the T case broke (unless it hasn't been working for a couple of months). Also it still feels like its in 4 when Im turning in 4 Hi?? But at the Hummer Happening everyone said neither of my front wheels were spinning when I tried to climb out of a mud hole. The popping occured on the hill climbs out there.

Any thoughts?