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Hi Guys,


A fellow duramax buddy of mine, just called me from Idaho. We live in Ca. He is towing his 30' fifth wheel over the sierra's and every time he puts the thing in four wheel drive the transfer case makes a hellatious droning noise. He only has about 10K miles on his 03 2500HD CC. He does have the H2 wheels and 315s on it. It also has quadzilla tuner on it. I think he is towing at the 70 hp level. Does anyone have any ideas?


Thanks.
 
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