Easy Quesiton.. How clean do I need to get the inside of the Rear Dirrential cover when I am draining and refilling. I have been scraping to get the previous RTV off but the previous owner seriously loaded it up on both sides and that stuff does not come off easy.. What can I use to clean it off with? I am using a razor blade scraper..

 

Thats about the best thing to use or maybe a wire brush then spray inside with brake cleaner...Tj

 

inside of cover or differential?

 

i use a drill with wire brush. comes out like new.
as mentioned, use brake cleaner to clean out the gears. just be sure to use a rag to soak up any puddles before you fill it.

 

EXACTLY!!!

 

wire wheel on the bench grinder for the silicone and carb cleaner to get it all clean

 

Can anyone tell me how I can tell if I have a limited slip differential.? I pulled the cover off and I need to know if I need to put in friction modifier??

 

angle die grinder with a 3m yellow roloc bristle disc

 

if its jacked up rotate one wheel with the transmission in neutral, if the other wheel spins in the oppisite direction then you have an open diff and do not need friction modifier. If both wheels spin the same direction then you have a limited slip or "posi" Also look in your glove box for a tag that says you must use the additive in the rear diff. Most xj's equipped with a trac lock had a tag in the glove box

 

i believe you can use royal purple diff. fluild too. i think it has the friction mod. in it.

 

Open diff. on left, limited slip on right