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Old 03-22-2026, 11:28 AM   #2
pjmoreland
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Join Date: Jan 2005
Location: CA
Posts: 7,025
Re: Vibration @ about 29MPH to about 32MPH

If it's speed related, then it is likely either your driveshaft, something in the rear end or a rear wheel. I'd start by crawling under the truck with the transmission in neutral and the wheels chocked to check the u-joints (and carrier if it has one) for play. Also check the rear end pinion bearings for any play along with the transmission output yoke. For wheels, you could try swapping the fronts with the rears to see if the source of the vibration moves locations.

Has your truck been lowered?
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