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Old 08-11-2002, 01:34 AM   #3
O'l Buck
Recovering Truck Driver
 
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Join Date: Mar 2002
Location: Orleans, NE USA
Posts: 1,883
easy check, put the rear on jack stands, put the tranny in neutral, crawl under it, grab the driveshaft and turn it each direction, if it is what i think it is, you have excessive backlash in your ring and pinion caused from age and wear in the pinion bearing and the gear surfaces themselves....if it is a U-joint or slip yoke, you will be able to see them move.......possibly it could be the carrier bearing rubber worn out and flexing up and down when under a load too........but most likely it's backlash.
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00 Dodge 2500 4x4, 24V cummins, 5 speed

Chad
South Central Nebraska
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