Dana 18 Transfer Case Parts Willys M38A1
Gears, Seals, Bearing Cups & Yoke Nuts for Reliable Power Transfer (1952–1971).
Why the Dana 18 Transfer Case in the Willys M38A1 Wears Out After Decades.
The Dana 18 transfer case is the mechanical link between the transmission and the front and rear axles in the Willys M38A1, enabling four-wheel drive on this military off-road vehicle. After decades of use, wear shows up on nearly every component: the intermediate shaft and output shaft gears wear down from constant power transfer, while bearing cups and yoke bearings lose precision as play develops. Oil seals at the input and output harden over time and start leaking, letting transmission fluid escape and lubrication suffer. Housing gaskets become brittle as well, while the shift knob and shift mechanism wear from frequent use. Yoke nuts and their washers also loosen over time, threatening the secure connection to the driveshaft. Regular inspection of these wear parts keeps the transfer case running reliably, especially on vehicles used heavily off-road.
- Intermediate Shaft & Gear: The intermediate gear shaft kit ensures play-free power transfer, and the matching front output gear keeps the ratio precise.
- Bearings & Bearing Cups: The output shaft bearing cup along with the front yoke bearing keep the shafts precisely positioned.
- Seals & Housing Gaskets: The front output seal provides a reliable seal, and the transfer case cover gasket prevents oil loss at the housing.
- Yoke Flange, Nuts & Washers: The Dana 18 output flange nut and the pinion nut for front and rear axle secure the driveshaft connection.
- Shift Knob & Poppet Ball: The T84 transmission shift knob and the poppet ball for the shift lock ensure precise gear selection.
- Shift Rod Seal & PTO Gasket: The shift rod oil seal keeps the shift rail sealed, and the rear PTO cover plate gasket seals reliably at the PTO connection.
American Manufacturing Quality for Your Transfer Case.
Most of the range comes from Crown Automotive – an American name known for precise, series-quality reproductions. Yoke and axle nuts come from Dana Spicer, also of American origin, while the propeller shaft slip yoke and the PTO gasket are supplied by Omix – likewise a US manufacturer.
Your Partner for Transfer Case Repairs.
Whether you need individual seals or a complete overhaul kit for your Dana 18 transfer case, we're happy to advise on installation order, torque specs, and compatibility with other Willys and Jeep models from this era. Your order ships from our warehouse as quickly as possible, so you can get started on repairing or restoring your M38A1 right away.