duct tape & zip ties
Join Date: Jul 2006
Location: Willis, MI
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Are you sure it is the pinion that is moving up and down. I would be inspecting the u-joints first. As they are easier to replace then the pinion.
If there is no wear or damage to the pinion gear and ring gear. Then I doubt it is the pinion bearings being bad.
I would be more apt to remove the drive shaft and inspect the u-joints. Also while the driveshaft is out. Grab the yoke on the rear diff. Pull it up and down, in and out. If there is a lot of play then yes your pinion bearings could be bad.
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Your Actions Today, Decide Your Future Tomorrow
2005 6.0 Crew Cab Long Box Lariat, current truck
2004 6.0 destroyed by contaminated fuel
2002 7.3L burnt