I have a 07 avalanche LTZ recently swapped t case rear half blew apart used same t case rpo and matching gm246 272 ratio after install was complete 2 wheel drove fine but no 4 wheel drive we got 2 foot of snow long story short it started grinding and popping when going from rev to drive then the 4x4 started working got unstuck guy home shut it off and this morning it did it again popped and banged going into gear didn't make it far now it dose nothing when you **** at all how much **** did I wreck hoping just another t case any one

I'm rough on it but but I treat her nice and do the upkeep and wrenching when needed
have a clue