Originally Posted by Gumby1
Ok, so if its got an aluminum housing its a limited slip diff, and a good old steel housing is an open diff which i can just use normal gear oil with no additive? Thanks guys
Umm, no. If you have an aluminum housing, then you have the Dana 44, but having the Dana 44 doesn't mean you have a limited slip differential. Another consideration is whether or not you have the factory tow package. Having the tow package means you have a 3.73 axle ratio. Which requires SAE 75W-140 Synthetic Gear Lubricant (which none of the autoparts stores I have checked carry). Models with Trak-Lok require an additive. Now, if your rear differential has Trak-Lok, it should
have a tag held on by one of the cover bolts that says "limited slip" "Trac-Lok" or similar, however, the tag could simply be missing. The best way, failing finding a tag, is to request a build sheet from Jeep
. Simply send them an email with your VIN requesting a build sheet. They will email one back to you, and you will find out all kinds of good stuff about your vehicle. What kind of rear axle you have, the gear ratio, type of trim, etc, etc.