New noise with new rear axle


Well-known member
Feb 24, 2006
Goldsboro, NC
Blew the axle up at URE last Oct and this week finally got the replacement axle installed as well as made the conversion to a 4 bolt flange from rotoflex. Here's where the problems began. Everything is secure, no play in the driveshaft, fresh diff oil(75w-90). When I accelerate and am on the gas pedal, things seem normal. When I let off the throttle, I begin to get a gear/bearing type noise until it slows to about 25 mph then it goes silent again. I have checked the U-joints on the driveshaft, they seem good. Again no play at the new flange. I'm lost as to what this could be, my only guess is perhaps a wheel bearing or something in the gears.


Well-known member
Nov 13, 2008
Los Angeles
Yep, check ring/pinion backlash. Pinion bearing may also be the issue, though I suspect you did a cursory inspection before installing the new axle.