I took my cover off the rear diff to check the oil and refill it (doubt it has been done in a long time by the look of it).

It has D300 stamped on the housing (where the seal goes) – what does that mean?

Also, it says D35C to the right of the housing, and I'm wondering if I have LSD or not? What are the ways to check for it?

Some pics:

 

FWIW,
The C stands for custom, not C-clip as some believe.

More pics?

Sure looks like an open carrier from here.

 

Limited Slip Diff's have clutch packs between the side gears and the carrier.

 

Unfortunatly I didn't get any good pics, too much of a hurry.

I did dump some LSD-oil in there just in case it is a LSD, I do have a metal plate on the cover (read somewhere that it has a metal plate if LSD(?)) but I coudlnt read what it said and I forgot to check the glovebox for any stickers.

 

ONE TIRE ON FIRE!!!! that thing is fully open.

 

Ok, the extra LSD-oil in there won't hurt tho, correct?

 

After looking at this site (http://www.jedi.com/obiwan/jeep/traclok.html) and also this (https://www.cherokeeforum.com/f2/lub...172/#post53310) I think I do have a Trac Lok Diff.
also, I found this in the glove box:

 

search the differences of internals between open diffs & limited slip

from the picture, it looks open... like serious said, LSD's have clutch packs... again, look it up

ur XJ might have HAD an axle with track-lock from the factory, but are u the only owner?? how do u kno the PO didnt swap axles, for whatever reason?

 

Trying to understand the difference thru looking at images, but looking at these older threads confuses the hell out of me:

https://www.cherokeeforum.com/f2/lsd-locked-85468/
http://www.jeepforum.com/forum/f59/8...-slip-1037247/

I'm just not sure where to look, where are these clutch packs located?

As for not being the only owner, nope, proud no.7 according to the books.

 

good efforts, but do u kno what urs looks like exactly... sounds like, per ur other posts, that it's all back together... did u take more pictures?

u see where the spider gears mesh together, sides to the top & bottom? the clutch packs would be outside of the side gears... towards the outsides of the diff, but obviously in the carrier... its explained in that jedi.com link

 

I was in too much of a hurry, so unfortunatly I don't have any better pics.

I think I'm starting to understand what you mean by where the clutch packs would be, found this pic (a dodge diff):
Am I correct in assuming the clutch pack is seen to the left thru a tiny "hole" right near the spider gear?

http://i695.photobucket.com/albums/v...g?t=1249151683

 

cant see anything much on the right, but that piece of metal on the left of the left spider gear is part of the clutch pack... on the right, to the right of the right spider gear, u can see rigged metal following the contour of the spider gear

easy, jack up ur rear end... rotate one wheel, if the opposite wheel rotates in the same direction, u have LSD... if it spins opposite direction, its open

 

Will def. do, that sounds like the easiest way to find out. Thanks xj^REMY.