T90 3-Speed Borg-Warner Manual Transmission Parts Willys M38
Bearings, Gasket Kit, Shift Knob & Spacer for Smooth Shifting (1950–1952).
Why the T90 Transmission in the Willys M38 Needs Attention After Decades of Service.
The Borg-Warner T90 3-speed transmission is the standard driveline centerpiece of the Willys M38 and has had to withstand engine power, vibration, and the typical off-road stresses of a military vehicle for decades. Bearings on the input and output shafts wear from constant torque transfer and moisture exposure, leading to play and noisy operation. Gasket kits harden over time and start leaking, which can cause oil loss and transmission damage. The shift knob wears through daily use, while poppet balls, mainshaft nuts, and spacers inside the transmission guide the shift forks precisely and cause rough gear changes once worn. Anyone looking to preserve their M38 in original condition or get it ready for regular driving should inspect and replace these wear parts in good time.
- Bearings: The input shaft bearing and the rear main shaft output bearing keep the power flow free of play.
- Gaskets & Rebuild: The gasket kit for the T90 transmission and the complete transmission installation/rebuild kit for a full overhaul.
- Shift Mechanism: The shift knob and the poppet ball for precise gear changes.
- Hardware: The mainshaft washer, the mainshaft nut, and the spacer for correct bearing preload.
American Engineering for Your T90 Transmission.
Every part for the T90 transmission comes from Crown Automotive – one of the most established American manufacturers of classic Jeep and Willys driveline parts. From bearings to gasket kits, shift knobs, and hardware, Crown Automotive delivers precision reproductions in production quality that meet the original manufacturer's specifications and suit restoration, repair, or ongoing maintenance of your M38.
Your Partner for the T90 Transmission Rebuild.
Whether it's a single bearing or a full transmission rebuild with a gasket kit, we're happy to advise on the correct installation order, proper bearing preload, and compatibility questions with the related CJ models. Your order leaves our warehouse as fast as possible after purchase.