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I noticed that, when my ’96 Caprice is backing up on smooth concrete, it kind of grinds and jumped just barely. Is it my gears in rear end? Any other issues could cause this?

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Should I work on gears or get a used rear end or new or what –  Ben Feb 22 '13 at 4:58
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if you register, you can edit and add to your poststs. –  theUg Feb 22 '13 at 19:27
    
Could be related: mechanics.stackexchange.com/questions/3235/… –  Mark Johnson Feb 25 '13 at 21:10
    
Civilian or ex-police 9C1? Do you know the RPO code for your rear end? –  Mark Johnson Feb 25 '13 at 21:11
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1 Answer

It could be any part of the driveline. A dry U joint may be binding. Have you noticed a squeek at very low speeds or when shifting from forward to reverse? Most differentials are pretty robust. If the differential came with posi-traction a fluid change may ease some of the symptoms. I believe these differentials didnot come with a drain you have to remove the cover to drain it. This will allow you to do a visual inspection. Rebuilding a differential requires some expensive measurement tools and a bit of patience. If the gearset is worn out, a junkyard unit makes the most sense from the cost and time perspective.

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Ya just at low speed not while shifting mainly while idling back or forward not giving no gas –  Ben Feb 23 '13 at 23:37
    
No squeak more of a rub or little grind –  Ben Feb 23 '13 at 23:39
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