I was driving down the road shortly after buying my tj in what i thought was 2wheel high but it was very shaky and when i hit 100 i mad a loud bang and wouldnt drive but it would drive in what it says is 4 wheel high it drives alot smoother and i beleive its actually driving in 2 wheel. So the question is will i need a transfer case because that what i beleive the problem is i havent tried putting it in any other modes im afraid to make the vehicle undrivable