T90 3-Speed Borg-Warner Manual Transmission Parts Jeep CJ6
Bearings, Seals & Shift Mechanism for Reliable Shifting (1955–1971).
Why the T90 Manual Transmission in the Jeep CJ6 Needs Attention After Decades.
The Warner T90 was for decades the most widely installed 3-speed manual transmission in Jeep and Willys vehicles and saw broad use in the CJ6 across the 1955 to 1971 model years, before it was eventually replaced by the T150. After such a long service life, most remaining T90 units show the same typical wear patterns: the bearings on the input shaft and mainshaft output wear down from decades of rotation, causing noticeable play or running noise. Gasket kits and seals harden over time and start leaking, letting gear oil escape and starving internal lubrication. Mainshaft nuts and washers loosen, spacers lose their exact fit, and the shift mechanism itself – poppet balls, detents and the shifter knob – suffers from years of use. Anyone restoring or fully overhauling their T90 should inspect and replace these wear parts in time, before more serious transmission damage occurs.
- Input Shaft & Mainshaft Bearings: The input shaft bearing along with the mainshaft output bearing.
- Mainshaft Nut, Washer & Spacer: The mainshaft washer, the mainshaft nut, and the matching spacer.
- Seals & Installation Kit: The T90 gasket kit and the more comprehensive T90/T150 installation kit for a full rebuild.
- Shift Mechanism: The poppet ball for the shift detent and the shifter knob for everyday operation.
American Manufacturing Quality for Your T90.
All parts for the T90 manual transmission – from bearings to gasket kits and the shifter knob – come from Crown Automotive, one of the best-known names in the American spare parts market for classic Jeep and Willys vehicles. 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 T90 Overhauls in the Jeep CJ6.
Whether you need a single wear part or a complete transmission rebuild with a gasket 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, T86 or T150. Most items ship within the next business day.