T18 4-Speed Borg-Warner Manual Transmission Parts Jeep CJ6
Gears, Bearings & Seals for Reliable Shifting (1955–1975).
Why the T18 Manual Transmission in the Jeep CJ6 Needs Attention After Decades.
The Warner T18 was a rugged 4-speed manual transmission commonly paired with a Dana 18 or Dana 20 transfer case in the later CJ6 production years. After decades in service, almost every remaining T18 shows the same wear patterns: oil seals on the input shaft and mainshaft harden and start leaking, letting gear oil escape and starving internal lubrication. The bearings on the input shaft and rear mainshaft wear down from decades of rotation, while internal gears like the reverse idler gear and synchronizing hubs wear from constant load. The clutch throwout fork also suffers from constant use, and the shifter boot and poppet ball are essential for a precise shift feel. Anyone restoring or fully overhauling their T18 should inspect and replace these wear parts in time.
- Internal Gearing: The reverse idler gear along with the 1st gear synchronizing hub.
- Bearings: The rear mainshaft bearing along with the input shaft bearing.
- Seals & Gaskets: The T18/T98 oil seal, the input shaft oil seal, the transfer case to transmission gasket, and the complete gasket and seal kit.
- Mainshaft Nut, Washer & Small Parts: The mainshaft washer, the mainshaft nut, and the small parts repair kit for a full overhaul.
- Shift Mechanism: The shifter boot along with the poppet ball.
- Clutch Actuation: The clutch throwout fork for reliable power transfer when disengaging the clutch.
American Manufacturing Quality for Your T18.
All parts for the T18 manual transmission – from bearings to gasket kits and the clutch throwout fork – come from Crown Automotive, one of the best-known names in the American spare parts market for classic Jeep and Willys vehicles. The gear and synchronizing hub are supplied by Omix, also a US manufacturer. These reproductions are built to OEM-quality standards and reflect proven American engineering that still holds up after decades in the field.
Your Partner for T18 Overhauls in the Jeep CJ6.
Whether you need a single wear part or a complete transmission rebuild with a gasket kit and small parts repair kit, we're happy to advise you on installation order, oil fill capacity and torque specs, as well as compatibility questions regarding other transmission variants like the T14, T15 or T150. Your order ships from our warehouse as fast as possible.