T98 JEEP 4SP TO GM (9-5/8 SO)

Advance Adapter

This adapter plate assembly is used to adapt a GM Engine to the Jeep T-18 / T-98 4 speed manual transmission. The adapter plate is 3.625” in length and is manufactured from 356-T6 heat treated aluminum alloy. Included in the adapter plate kit you will receive a two piece adapter plate, new 4.686” bearing retainer, pilot bushing, gasket, seal, fastening hardware, and adapter instructions.

Compatible Engines

• Chevy/GM Small Block V8
• Chevy/GM 4.3L V6
• Buick 225 & 231 V6

Note: This adapter plate kit only fits T-18 / T-98 transmission with a input shaft stick out of 10”.

Note: With our adapter plates, we utilize a new front bearing retainer to obtain proper bell housing alignment. Chevy adapter plates we use a small index of 4.686”, if your bell housing utilizes the larger 5.125 index diameter you will also require P/N 716078 .

Transmission

The T-18 is a heavy duty four speed with unsynchronized first gear. These transmissions were manufactured by Borg Warner and they have a cast iron case. The casting number on the drivers side of the T-18 is T-18 or 13-01. The T-18 has a 1 1/8″ 10 spline input shaft and a 1 3/8″ 6 spline output.

The T-98 has a very similar appearance to the T-18 except a casting number of T98. It is heavy duty like the T-18. The T-98 has a 1 1/8″ 10 spline input shaft and 1 3/8″ 6 spline output.

Note: T-18 / T-98 with the 1 3/8 diameter input shaft cannot be used with our adapter plate kits.

Bill Of Materials

• LOCK WASHER 7/16 STD PLTD / 724303
• H.H.C.S. 7/16 -14 X 1-3/4 gr.5 zinc / 724308
• ADAPTER CASTING 2 THICK / 711521-2
• BUSHING- PILOT .629 TIP GM T90 / 716171
• JEEP T-15 3SP TO CHEVY V8 KIT / 712510