Advance Adapters Chevy to Jeep bellhousing adapters are designed to marry your GM engine to the Jeep T-18 4-speed manual transmission. The adapter plates are .750 in. long and are manufactured from 356-T6 heat-treated aluminum alloy. Included in the adapter plate kits are a 2-piece adapter plate, a 4.686 in. bearing retainer, pilot bushing, gasket, seal, fastening hardware, and adapter instructions. Having outdoor fun starts with getting your hands on Advance Adapters Chevy to Jeep bellhousing adapters.