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Adapting the 

Chevrolet & GM Standard Shift Bellhousings 

to the

Jeep CJ & FSJ Borg-Warner T14, T15 & T18 Transmissions

This adapter assembly adapts GM bellhousings to the CJ Jeeps with the T14 three-speed transmission, T15 three-speed transmission and the T18 four-speed transmission.

Product & Features

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This plate style adapter is cast and machined of a high-grade aluminum alloy, featuring an integrated precision machined bearing retainer. Included are the GM bellhousing locator / throwout sleeve, seal and hardware.

Applications & Compatibility

Jeep CJ Transmission Versions

This adapter assembly adapts GM bellhousings to the CJ Jeeps with the T14 three-speed transmission, T15 three-speed transmission and the T18 four-speed transmission.

  • The Jeep T14 was standard equipment on six-cylinder (AMC 232 & 258 c.i.d) engines from 1972 - 1975 and has an input shaft stickout length of 8.25" (measured from pilot tip of shaft to front face of transmission case).
  • The Jeep T15 was standard equipment with the AMC V8 engines from 1972 - 1975 and has an input shaft stickout length of 8.25".
  • The Jeep T18 was the optional transmission found in both I6 & V8 CJ Jeeps from 1972 - 1975 and has an input shaft stickout length of 9.1".

Kaiser era Jeep CJ T14's from 1967 - 1971 (Buick V6) are not compatible with this kit.

For Jeep CJ T18's from 1976 - 1979, refer here.

GM Bellhousings

GM bellhousings typically feature either a 4-11/16" rear face bore or a 5-1/8" rear face bore, the latter typically only from Chevy / GM trucks from 1968-1991. Our adapter will work with both. If you are uncertain of your bellhousing bore, choose the 5-1/8" press-on spacer ring that can be used or omitted to cover either situation. The ring is easily returnable for credit if not used in the installer's application.

Installation Requirements

The adapter is easily and quickly installed onto these transmissions and no change of input gear or other transmission internals are required. Cutting the transmission input shaft is not required as the adapter spaces the transmission properly for the GM crank and clutch assembly.

The total adapted length of a T14 is 11-7/16". The total adapted length of a T15 is 11-3/4".

Chevrolet pattern, Gen I & II small 4 ­11/16” bore


Chevrolet pattern, Gen I & II large 5­ 1/8” bore


Chevrolet pattern, Gen III & IV small 4 ­11/16” bore


Chevrolet pattern, Gen III & IV large 5 ­1/8” bore


Chevrolet Muncie Saginaw Bellhousings

The classic Chevrolet bellhousing, with the four-bolt rear pattern. Buick, Olds, Pontiac and other bellhousings with the same rear face are equally compatible.

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