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L or LS Limited Slip differential Each part number group contains axle information from the three most recent eras of Jeep history: AMC / JEEP, Chrysler / Jeep, & Daimler-Chrysler. Most common for rear regardless of axle manufacturer. OEM / Factory Differential Types NL Non-Limited Slip differential ('open' differential) ALL OEM front differentials. MJ versions have spring perches on bottom. 8.5 inches Primarily found in late 80's XJ's with towing package. 44 Dana 44 rear axle 10 bolt cover Angular cover and housing. 8-1/4 Chrysler 8.25 inch rear axle 10 bolt cover Rounded housing cover with flattened housing bottom Plastic plug to fill differential w/ oil. Plastic plug to fill differential w/ oil. Looks like it's been 'mashed' down from the top. 35 Dana 35 rear axle 10 bolt cover Rounded housing cover. 7.56 inches Threaded plug to fill differential with oil. 30 Dana 30 front axle 10 bolt cover Round with flattened vertical cover sides. 20 Dana 20 rear axle Cover is very round when viewed from the back. Photo, diagram, sketch or cave drawing of the axle housing, cover or cover gasket. with this general differential housing shape. with this number of bolts holding the cover on. ONCE YOU HAVE LOCATED THE PART NUMBER AND AXLE CODE, YOU CAN USE THE DATA BELOW TO IDENTIFY WHAT YOU HAVE (or had before someone re-geared it) There are frequently questions about "what axle do I have?", so i though that I'd just post the relevant data to get the job done. I found the following information on-line and have never seen it posted here.