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GM (Chevy/Buick) Engine to Jeep T98/18 4 Spd (9" Input) Transmission Kit

On sale $397.00
Retail Price:$462.06
Your Savings:$65.06(14%)
Part Number:AA-712521

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Engine Specifications:
Transmission Model:
Customer Location:
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 .500” in length and is manufactured from 356-T6 heat treated aluminum alloy. Included in the adapter plate kit you will receive an adapter plate, 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 9-3/8”
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”, (the larger index retainer, P/N 716051, can be substituted for the 5.125” bell housing).


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 1/16" 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.