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Discussion Starter · #1 ·
I posted this earlier on another thread. However, I am hoping that the tech guys can help me. My '04 2500HD duramax makes an audible clunk as I shift it into 4 hi on the fly. It doesn't do this at rest. My dealer can't find anything wrong with the front splines or with the fluid in the transfer case.
Any suggestions?
 

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Discussion Starter · #3 ·
I wouldn't worry about this if it had done this from the very beginning. However, it just started doing this a few weeks ago. My truck has 37,000 miles on it, so it is out of factory warranty; I do have an extended warranty, but it won't pay for anything unless it is broken. I don't want to wait that long. Would it help if I changed the fluid in the front diffential and in the transfer case to a synthetic? The manual says synthetic can be used for this type of 4 X 4 system.
 
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