Originally Posted by 1986cj
I thought they only used the adaptor or longer, deeper bellhousing on non CJ apps. Interesting read on one place with info for the T98 is that the T98 was never mated from the factory to a AMC engine. Not sure if this is true or not.
I know full size jeeps used an adapter and those trannys are not good for conversions in a CJ due to different length in bellhousing and input shaft. But according to Novak, t18's in pre '76 CJs used an adaptor plate. If OP didn't get this plate when he pulled the 18 maybe that is where the extra length is coming from. Other than that you are correct that the t18 from a later year, which are the more common ones should if anything be slightly shorter and you can use a different pilot bushing that is bigger and sits further away from the crank.