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Hey I have a 97 2wd with 75000 miles. The truck has developed a roar in the rear end. IT is a constant sound doesn't change when corning and doesn't seem to speed up or slow just louder the faster you go. Any Ideas where to start looking for the problem??

Thanks JW
 

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Ring and Pinion...

Just want to make sure you said it is louder the faster you go? Bearings/Gears eating themselves more than likely
 

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Block a wheel, place in neutral, and crawl under, with a giant screwdriver or heel bar, for prying, and see if the slop is 1. in the rear ujoint, 2. in the axle pinion, (ecch, that would be expensive) or 3. in the front driveshaft ujoint. Chances are its one of them...Good Luck!!
 

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The noise out of the rear (if in the diff) can be from toasted bearings/races. But it could just be that the rear has bad teeth contact. If your backlash is too excessive it can cause a howling sound as you go down the road. Re-shimming the carrier for correct backlash/pattern can fix that. If you have the tools id say go ahead and pull the bearings and replace em while you are there.
To check it (if you determine play IS in the diff) Pop your cover - be sure to look at the fluid as it drains for any shiny metal junk in there.
(if you have a dial indicator you can be more accurate) but grabbing the ring gear, move it up and down until the teeth on ring gear hit teeth on the pinion. There should not be a lot of play. I think factory is like 6-12 thousands.
 
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