Dana 18 Transfer Case Parts & Upgrades for Willys MB

Wartime 4WD Engineering Rebuild: Premium Transfer Case Solutions for Your Willys MB.

The heavy cast-iron Dana 18 solid transfer case (Spicer 18) is the mechanical backbone that defined the legendary, unstoppable off-road performance of the 1941–1945 Willys MB military Jeep. Featuring a highly distinct offset-output layout where both front and rear driveshafts exit on the passenger side of the vehicle, this assembly is subjected to severe radial torque loads. Over eight decades of historical convoy runs, storage, or tough trail use, original paper shims and oil seals inevitably degrade, causing severe gear fluid leaks and drivetrain play. Our specialized online inventory features professional-grade replacement hardware to successfully rebuild and seal your vintage gear-driven transfer case back to museum standards.

Quality authentic Engineering for Historic Drivetrains: Crown, Spicer & Omix.

For full-scale mechanical overhauls and a leak-free assembly, we stock a comprehensive selection of professional-grade seals. Re-seal your casting seams perfectly with transfer case housing gaskets, output extension gaskets, and shifter shaft oil seals from Crown Automotive, paired with precision transfer case cover gaskets from Omix. Eliminate front drivetrain growl and bearing play effectively with premium replacement front output shaft bearings, packed complete with heavy-duty bearing cups and output seals.
Secure your mechanical connection to the universal joints using high-tensile input/output yoke nuts from Dana Spicer, matching Crown shaft nuts, Spicer yoke flat washers, and Crown main shaft lock washer plates. We also restore crisp functionality to the classic twin-stick cockpit controls, supplying replacement shift rail detent springs, mechanical interlock pins/balls, and factory-correct shift knobs from Crown to preserve that showroom military look inside your cabin.

Expert Support for Your Historic Willys MB Transfer Case Rebuild.

Rebuilding a gear-driven Dana 18 transfer case and setting the correct intermediate shaft bearing preload requires technical accuracy and historical specification knowledge. Our outstanding customer service is here to guide you through selecting the correct internal thrust washers, small hardware shims, and gaskets tailored to your specific wartime production year. With our fast shipping, your replacement drivetrain parts will arrive quickly, keeping your classic Willys MB functional and convoy-ready.