I have a 2003 3500 4x4 cummins 6spd transmission manuel shift to 4 wheel drive. About a week ago while driving up a steep hill with no load in 4 wheel low my truck popped. Sounded like it was under the seat. Does not do it in 2wheel drive. Could this be the chain in the transfer case? When in 4 wheel low in first gear I can hold the brake and the truck will continue to pop. I've placed this on the (4x4 talk) thread also. Any help would be appreciated.
Not sure, but here is that section of the 03 service manual. Not sure if it would help diagnose the issue or not. If it is broken, I think they are not that hard to swap if you could fine a used one somewhere.
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