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My 04 GMC 2500HD made some ungodly noise on a long downhill on a mountain highway.
Shifted in to neutral, noise was still there.
Stepped on the gas to see if the noise was engine rpm related, noise goes away and hasn't returned....
Stopped and checked belts and fluids and anything obvious to no avail.
How do you diagnose that????
__________________
Bill K.
"I started out with nothin and I still got most of it left...."
83 911 SC Guards Red (now gone)
And I sold a bunch of parts I hadn't installed yet.
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