T18 Manual 4-Speed Borg-Warner Transmission Parts for Jeep CJ5
Gears, Bearings, Seals & Hardware for Reliable Shifting (1972–1979).
Why the T18 Transmission in the Jeep CJ5 Wears Out After Decades.
Built by Borg-Warner, the T18 manual transmission was standard equipment in the Jeep CJ5 from 1972 to 1979, reliably transferring power from the 3.8- to 5.0-liter engines to the drivetrain as a rugged 4-speed gearbox. After decades of service, though, typical wear shows up: input and output shaft oil seals harden and start leaking, letting gear oil escape and starving lubrication. First-gear synchronizer rings wear down, causing notchy shifting, while the reverse idler gear develops noise from material fatigue. Mainshaft bearings develop play, shifter boots crack from UV exposure and age, and the mainshaft locknut works loose over time from vibration. Under heavy use, the housing bell can develop cracks as well. Anyone running a T18 off-road should check these wear parts regularly to avoid costly follow-on damage.
- Gears & Synchro Parts: The reverse idler gear and the 1st gear synchronizer hub keep shifting precise.
- Gaskets & Oil Seals: The complete gasket and seal kit along with the transfer case to transmission gasket prevent oil leaks.
- Shifting & Hardware: The shifter boot and the mainshaft nut keep the shift mechanism reliably together.
- Bearings & Housing: The rear mainshaft bearing and the housing bell form the stable foundation of the transmission.
- Clutch & Switch: The clutch throwout fork and the reverse light switch round out the range.
Proven American Brand Quality for the T18 Transmission.
Gasket kits, oil seals, bearings, and the housing bell come from Crown Automotive – American engineering that has proven itself in the Jeep parts market for decades. The reverse gear and synchronizer hub are supplied by Omix, also American-made, while the reverse light switch comes from Standard Ignition. All three brands deliver precision-fit quality that matches the original.
Your Partner for T18 Transmission Repairs.
Whether you need a single oil seal or a complete T18 overhaul, we're happy to advise on torque specs, the correct installation order for synchronizer hubs and gears, and compatibility questions with the transfer case and clutch. We're also glad to help if you're unsure about the exact model-year fitment for your CJ5. Most items ship from stock as fast as possible after your order.