Rear diff whine...

As the title says, after last weekends wheeling i was on my way home and started to hear a whine from my rear diff. It only does when under load (pressing gas) through gears 1-6. Is it my ring and pinion? Or is it possable that the diff oil has broken down? Has Lsd added to it.

 

Nothing huh

 

If it changes with acceleration it could definitely be the R + P. Start with a diff fluid change. If the sound gets worse, you'll want to have it checked out professionally.

If you dragged the pinion flange or driveshaft while wheeling, it's possible you damaged the crush sleeve that sets pinion preload. If that's the case, you're looking at a new gear setup at a minimum.

 

I had something similar to this that i noticed. After offroading when i let off of the gas around 50mph it sounded like a whine from the rear diff. Got home sprayed off the under carriage and took a quick look for any thing out of the ordinary. Took it for a drive again and no whine, never figured out what it was. Good luck with figuring it out.

 

Dragged...?

 

Mine started to whine to. Pretty sure it was the pinion bearing or the crush sleeve. Didn't exactly figure it out cuz I just regeared. It only happened when there was load on the diff. Either accelerating, or decelerating from engine braking. Made no noise at all in neutral. Put the rear on jack stands and had to set the ebrake while it was spinning the tires with the locker engaged to get enough load to produce the noise. It was crazy loud from the back of the diff.

We pulled the diff and tried to diagnose it without pulling the gears apart but couldn't tell what it was. We did find a nick in the ring gear that was over the pinion pattern so that possibly could have caused the noise, but we doubted it.


Mine sounded like this
http://www.youtube.com/watch?v=RtmWvUPvS74

 

http://www.differentials.com/technical-help/diagnosing-differential-problems

I'd change the oil and continue to drive and monitor.

 

Agreed.

My diff noise turned from a barely noticeable whirr into a VERY obvious knocking in a matter of weeks.

Be hesitant about trips far from home or pavement until this is resolved would be my advice.

 

K thanks guys maybe time to serch for a regear?

 

Possibly... then again your gears could last another xxxxx amount of miles!

 

That is a horrable noise lol anyone knowof someone trying to sell arb equipped 4.56-4.88 front and rear?

 

Last I checked niwi had his rear arb still???

 

Yeah i sent him a pm but nothin... Probly got 100s of pms with the price of the front

 

Is it possible to do the rear in a differnt gear for a bit? As long as i dont engage 4x4?

 

Yes, you just make damn sure you don't engage 4wd. In fact, I would take the front driveline out until the gears matched.

 

Yes. The key being DO NOT ENGAGE 4x4.

 

I would think so too but its only making the noise under acceleration not decel...like when i gear down

 

Perfect ill start there thx for the help guys

 

Typical pattern is noise under acceleration followed by noise under both accell and decell, followed by constant noise, followed by kablooie.

8.4 rear diffs are solid. The elocker diffs are about as solid a potato chips.

 

Ill start with ujoints... If it comes to it ill buy a new bag of potato chips