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[eddscott]

I'll be jacking the Jeep up in a bit and seeing if the wheels spin freely. 

I moved it into 4WD last night and when moving back into 2WD it got stuck in PT.  It made a bit of a clonk again and I think dropped back into 2WD so I think it is starting to free up.  Still feels like the rear is floating though.

Not sure if its just me but it does seem to have a bit more of a rumble than it did before.  It would rumble faintly when in 4WD but not so much in 2WD.  Now though, the rumble doesn't change. 

[eddscott]

So this morning I put the front of the Jeep up on axle stands and tried to move the wheels. 

With the 'box in P and the selector in 2WD I turned the wheel and it rotated freely with the front prop rotating too - the other wheel didn't move.  I then put it in 4WD and tried again.  This time the front prop didn't move and the wheels rotated in opposite directions.  I put it back into 2WD and rocked the wheels and after a clonk it released and was back in 2WD with the wheel rotating freely.


I put the rear on stands and with the 'box in P and the selector in 2WD, I could just about turn the wheel but both wheels turned in the same direction with the rear prop rotating too. 

I then but the 'box in N and the selector in N and tried again.  Both wheels would only turn in the same direction.  I didn't anyone else with me so asked my daughter and her friend to rotate the wheel (safety first) with me rotating the wheel in the opposite way.  We couldn't do it. 

I dropped one wheel and tried to rotate the other wheel by hand and it was quite hard to turn the wheel. 

I've posted some quick vids on youtube to try to show what is happening. 

This the front end appearing to work OK.   The bit at the end is very cringeworthy so apologies.




Here I'm trying to rotate the wheel with the other wheel on the ground with everything in N and it barely moves. 




In this one I'm not sure what the selection is but in between my unfortunate grunting you can hear a knocking sound as the wheel is rotated. 



So would the above suggest that there is something up with the rear diff?  If the rear diff was locked and the other wheel was down, would I still be able to rotate the wheel.  Or is it that the outer gear of the diff is working but the inside gears (the diff bit) aren't working as they should.  I couldn't seem to get the rear wheels to rotate in opposite directions (I know the vid shows one wheel down but I did try with them both up)

[Panic mechanic!]

I thought the 99's xj had open diffs so it should rotate freely but it sounds like  you have a lsd axle fitted, so the clutch packs may be buggered so you  need to rebuild them or replace the axle by the sound of it.

[eddscott]

I've been told that the rear diff is Dana30, if that helps ??

[Panic mechanic!]

its all down to how mechanically minded you are, I think your next step is to drain the oil from it and remove the cover and see what it looks like inside and see if there is anything obviously wrong with it.

[chrisjones]

You should have an open diff on your truck as the LSD was dropped when the facelift model was released.  I think the LSD may have still been an option though.

As Panic says, it sounds like you may have one (either from new- or replacement axle) in which case the clutch pack may be buggered.   Open the diff by removing the rear cover (Remembering to put something under it to catch the oil first!).  I'd get some replacement oil and silicon diff sealant first and a shot of additive (incase there is an LSD) so you have everything needed to put it back together if there's nothing wrong inside.

[Bubba]

you axle is a 35c

[isle of man]

you axle is a 35c

If you have a 4.0 Perol Cherokee this will be fact.

[The Smiths]

The orvis may well have a LSD fitted, which would give you both spinning the same way - look in the glove box and see if there is a sticker telling you so