I have a 2004 chevy 2500 hd and when I engage 4x4 theres a popping noise coming from transfer case area. I put it up on a rack and engaged 4x4 and makes no noise but when on ground it pops bad and sounds horrible. I was thinking probably jumping in and out of 4x4. I checked all u-joints, cv axles etc. And no leaks anywhere. Oil level is also good in t-case. Any suggestions?
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