Diagnosing bad rear pinion bearing vs bad yoke?

REDLYNER

REDLYNER

Mall Crawling Race Rig
Joined
Oct 31, 2008
Location
Mountain Island
Trying to track down my vibrations and whirring noise in my TJ. Any suggestions?

Issue: Loud "whirring" noise upon acceleration, almost sounds like gears. Vibrations through entire cab. Noise and vibes happen 90% under acceleration, almost completely go away under cruising. But not entirely. Vibes and noise increase as speed increases, but strongly reduce once desired speed is reached (only reoccurring as gas is applied to maintain speed).

Checked so far:
*Unhooked front driveshaft, still same symptoms.
*New Atlas has roughly 300 miles on it, full of fluid and no leaks.
*Rebalanced rear driveshaft with new cardon joint and ujoints.
*Pinion angles look good.

Leads me to believe either bad pinion bearing or bad pinion yoke. Just curious how to diagnose or isolate to confirm. Any suggestions? What pictures or video could I post up to help better describe?

Thanks!
 
Well... Does the yoke move laterally?

Did the noise start after the atlas was installed?

Generally speaking, yokes don't go bad. The tabs get worn, preventing the u joint from centering, or the wear surface at the seal gets scored, causing a leak.
 
remove rear drive shaft & drive it in front wheel drive. See if the noise persists. May narrow it down more
 
Jeff B said:
remove rear drive shaft & drive it in front wheel drive. See if the noise persists. May narrow it down more
Click to expand...

I did that a couple months ago and there was improvement, but it's been too long to remember exactly. I can't do that right now because the front driveshaft is a rainbow after the last race. The front ds is getting fixed next week.... So maybe I can try then.
 
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