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Originally Posted by dennyge
About 2 weeks ago, I began hearing a suspicious hum coming from the rear end (not my rear end, the truck's!) of my 99 5.9L. I originally thought it was a tire hum, but letting off of the accelerator causes the hum to go away. I am guessing something is amiss in the differential or driveshaft. Not being much of a serious mechanic, and not having a whole lot of extra $$$, what would you suggest?
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my 98 had a hmmmmm also and it happend when i let off the gas and then it progressed to constant but worse when i let the gas off. It was the rear pinion bearing. common on these trucks. a way to check that is crawl underneath the truck, grab the u-joint where it goes into the pumpkin, shake it like a mad-man and if it moves, its your bearing, if it doesn't, i'd take a look at your rearend gears, also common failure w/ these trucks. be sure to use a synthetic gear lube if you drop the pumpkin cover.