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loud popping noise

1K views 3 replies 2 participants last post by  ggravant 
#1 ·
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.
 
#2 ·
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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