think my 8.25 is dying... -
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post #1 of 5 Old 01-19-2014, 07:40 PM Thread Starter
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1998 XJ Cherokee 
Join Date: Feb 2011
Location: Lenni
Posts: 336
think my 8.25 is dying...

The jeep has given me over a year of trouble free usage and with all my hobbies and needing to move things ( MX bikes, sleds, dead stuff) I decided I need a pick-up. so ive been doing some things to get the jeep ready to sell and noticed my trans was loose ( I am lucky enough to have a standard trans XJ ) so I popped a new trans mount in and solved that but now have a hesitation and slam when I put her in gear and let out on the clutch. seems the pinion is slamming into the ring gear inside maybe? theres play back there as well as a Vibration in the rear driveline when on the gas. I don't believe its the Ujoints as they are all less then a year old and the DS has zero play in it but the pinion has the play. I am going to try to drain the rear this week and see if something is chewed up or what but don't know much about rears or what to look at or for or how hard it could be to fix.
any ideas fellas? kinda stuck with the jeep in almost undrivable condition and school starts Wednesday so this is about the worst time this can happen.

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post #2 of 5 Old 01-19-2014, 10:48 PM
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1999 XJ Cherokee 
Join Date: Jan 2012
Location: Cedar Falls
Posts: 459
The only way your pinion could be slamming in to the ring gear is if the backlash is way off. The only ways backlash really get out of adjustment is through gear wear or one of the spanner nuts has loosened up and allowed the carrier to move. On the Chrysler 8.25, the backlash is adjusted and held in spec with large spanner nuts that locate and hold the differential carrier bearings in position. There is a small locking clip that bolts on each of the carrier bearing caps and locks the spanner nut in place. It is possible that one of these has come loose and allowed the spanner and bearing to move. There's a few good writeups on here about rebuilding the 8.25 with lots of pics that might be helpful as you open it up and start looking for the problem.
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post #3 of 5 Old 01-20-2014, 05:28 PM Thread Starter
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1998 XJ Cherokee 
Join Date: Feb 2011
Location: Lenni
Posts: 336
Ok when I pop the cover Thursday I'll see what I find. May just start looking for a parts jeep and it someone's rear outta it I guess
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post #4 of 5 Old 01-21-2014, 08:39 AM
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Does the pinion have play in and out? back and forth? rotationally? Each of these shows a different kind of wear. Some play rotationally is OK but the other two should have none. Based on what you describe I suspect the spider gears.

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post #5 of 5 Old 01-21-2014, 10:10 AM
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Check for worn bushings in rear shackles and rear leaf spring eyes. Sloppy movement in these areas will make the pinion dance around and cause clunks on acceleration.
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