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Rear Diff Noise


 
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Fatalfunnel
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Joined: 28 Jun 2005
Location: NW Alabama

PostPosted: Tue Jun 28, 2005 9:28 pm    Post subject: Rear Diff Noise Reply with quote

Hello, new to the board, first post. I just bought a 97 Cherokee Country that has a "roaring" noise at speed, but only under load (gas mashed). When coasting, or on a slight downhill where there is no significant load on the drivetrain, all sounds well. I haven't changed the gear oil yet, but when I do, should I add some Lucas stuff or some other kind of additive, or do I just have problems that will have to be addressed mechanically. Either way, no major big deal, just wondering if anyone else has been here and what you did to fix?

Looks like a great board and a huge asset to have.
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ThePhantum
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Joined: 23 Jan 2004
Location: I knew it...I'm surrounded by Assholes!

PostPosted: Tue Jun 28, 2005 10:02 pm    Post subject: Re: Rear Diff Noise Reply with quote

Fatalfunnel wrote:
has a "roaring" noise at speed, but only under load (gas mashed)

So a guy goes to the doctor and says "Doc, it hurts when I do this". The doctor says "Don't do that". rofl

Seriously, my guess would be pinion bearing. Usually, if you hear bearing noise under load it's rear axle. If it's a very low, growling noise it might be diff bearings though...pinion bearings are usually higher in pitch. It's possible that it's a wheel bearing too. Take it to a big empty parking lot someplace and turn the Jeep sharply left and right. That will load the wheel bearings and, if they are the culprits, the noise level will change.

Check the u-joints too. I've heard horrible noises coming from underneath vehicles that turn out to be a bad u-joint.

Personally, I wouldn't bother with Lucas. Just put in a good quality gear oil and if it has a Limited Slip make sure to put in the proper amount of additive.

HTH...and welcome. Wink
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