You can go with the NA manual trans, out of any year, but I don't know of any way to attach the transfer case. You would have to divorce it.
The Auto trans in the RX7 is a common trans (I think it was used in Subbies, Nissans and Ford Rangers). It is possible that you may be able to get a transfer case setup to fit. I have never seen it done. The Auto trans is weak, they don't hold up well to a stock NA rotary. Mine is smoking after 5 0-60 runs.
You can buy adapters from a rotary to a Volkswagen Beetle (air-cooled) trans, a Ford Trans and a Chevy Trans from Kennedy Engineering. I have also seen mounting adapters made to use the rotary auto-trans bellhousing to contain a clutch and attach to the front of a transmission.
This thread should probably be moved elsewhere.
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1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers)
1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic)
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