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Old 02-09-2014, 06:47 AM   #1
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unkown noise

I have 91yj when i am slowing down to a stop you can feel and hear something hit it sounds from the rear of jeep.could rear end have that much pinion slop the brakes looked good.cant find it driving me crazy..

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Old 02-09-2014, 07:23 AM   #2
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check u joints and loose exhaust

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Old 02-09-2014, 07:32 AM   #3
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Checked.you can feel the hit from the wheels if you slow down with the gears coming to stop and using little brake it wont do it . but if you stop some what hard with the brakes it hits .?
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Old 02-11-2014, 03:53 PM   #4
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check u joints and loose exhaust
X2...

Also look at the spring bushings and engine/trans mounts (this includes the bolts). Somethin is moving under a decel load, start tugging an pushing on stuff till you find movement.
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Old 02-11-2014, 04:54 PM   #5
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I would say that if you checked the u-joints and exhaust, and they are good, then its something in the rear suspension.

Possibly a broken center pin, loose u-bolts, Or even a spring bolt that has rusted to the eyelet will cause a similar noise.

Jack it up from the frame (or set it on jack stands) so that the rear end is hanging, then see what you have play in.
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Old 02-18-2014, 06:33 PM   #6
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unknown noise

Thanks everyone i put 4inch lift kit in rough country maybe i have something loose some where once again thanks
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Old 02-18-2014, 08:48 PM   #7
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Thanks everyone i put 4inch lift kit in rough country maybe i have something loose some where once again thanks
Did you keep your track bars in and use their bracket to make it fit? Those shouldn't even come with the kit since they aren't needed and the track bars are known for causing the noise your describing.
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Old 03-01-2014, 12:55 PM   #8
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i removed track bars before i did lift kit.
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Old 03-01-2014, 08:38 PM   #9
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i removed track bars before i did lift kit.
If you are sure it is in the rear then check the diff. Possibly pinion bearing. That can knock. Remove the cover and check asap. If that is the cause and it fails it will be scary.

A sign you are having problems is oil leaking from behind your rear yoke. You can also grab your driveway and pull it side to side to check the play. And of course check your fluid levels

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