From JeepTech and JeepTech Publishing LLC, the Jeep knowledge base.
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These articles cover the rear axles used in various Jeeps from 1941 until the present. The data needs to be updated for some of the newer Jeeps like the Liberty and the full size Jeeps.
Chrysler 8.25": The Chrysler 8.25" axle has been used in the ZJ (Grand Cherokee) and XJ (Cherokee). Its usage depends on what was available at the factory.
Dana 35c: The Dana 35c is the axle used in all YJs (Wrangler) from '87-'95 and it is the standard axle in the TJ (Wrangler), ZJ (Grand Cherokee), MJ (Comanche), and XJ (Cherokee).
AMC 20: The AMC 20 is the axle found in most '76-'86 CJs, '80-'86 SJs, and as the heavy-duty axle option in 1986 MJs.
Dana 30: A Dana 30 rear end was used briefly in the C101 Jeepster during the 60s.
Dana 60: The Dana 60 rear axle was only used in heavy half ton and better J series pickups.
Dana 44: The Dana 44 has been used in various forms in nearly every Jeep model.
Dana 53: The Dana 53 rear axle is used in Willys pickups starting in 1956.
Timken 51540: The Timken 51540 rear axle is used in Willys pickups before 1956.
Dana 41: The Dana 41 rear axle was used from early '46 until early '50 in CJs and Willys Wagons.
Spicer 23: The Spicer 23 was only used in MBs and early CJ-2As.