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1994 GCL noise from rear

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Joined: 16 Feb 2006

PostPosted: Thu Feb 16, 2006 10:05 am    Post subject: 1994 GCL noise from rear Reply with quote

My '94 Grand Cherokee Limited has a tapping noise eminating from the rear that seems to follow the velocity of the wheels. The noise in more noticable when decelerating then accelerating, and as mentioned, speeds up and slows down in correlation to the speed the vehicle is traveling at. Could this be an issue with the differentials, fluids, wheel bearings??? It was much quieter last week, too! I'm new to this car and Quad-track cars in general. Any advice would be much appreciated.
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Joined: 02 Jan 2004
Location: Epping New Hampsha

PostPosted: Thu Feb 16, 2006 10:31 am    Post subject: Reply with quote

When was the rear grease changed? Is the level correct?

Couple of things to check.

1st chock the front wheels, then jack up the rear so that both rear wheels are off the ground. Put the tranny in neutral. You dont want any pressure created by having the tranny in gear.

Crawl under and give the driveshaft a shake at both ends. Watch and listen for u-joint play. If theres any, they need changed. Early symptoms of worn u-joints is rattling or clunk noises when getting on and off the throttle. As they get worse, ussually you will start getting a vibration, then followed by failure.

IF its wheel bearings, you should also see gear oil or grease leaking to. As bearings get loose, the oil seal gets worn quickly. Signs of this should show as noticable oil and dirt collecting at the base of the backing plate. The hub will have oil/dirt residue all around it too. Pulling the hubs will show oil/dirt and brake dust mud all over the brake pads and springs.
Wheel bearing issues will also cause odd wear on the rear tires.

Or it could be something simple like what I first hit on....low or worn out rear end fluid. Both will cause noise. Even when new there is some movement between the ring and pinion. There has to be some or the would wreck each other. With use over time there can be some wear which causes noise, but that dosent mean that its gonna fail. If your not sure when it was changed last, its probably time to be done. If there is any oil residue apparently leaking past the seal then its time to pull the cover to re-seal it and put in fresh oil.

If thats the case, as long as you dont see lots of metal chips in the old grease then a change should calm the noise....if its from old oil. Synthetic works even better then mineral oils for quieting gear noise.

Real Jeeps dont wear Bra's
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