Join Date: Apr 2001
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Re: AMC 258 Overdrive
Seems like to me that you would have little problem mating one of those transmissions to an AMC engine in a Jeep. Likely these will be 2wd transmissions with a long tail housing. The issue then would be to find the correct output shaft and tail housing/adaptor to mate this 3spd OD transmission to your D20 transfercase.
I don't know what model transmission AMC used for their cars with that option so I won't be much help finding if a 4wd type output can be swapped in. Perhaps try here <a target="_blank" href=http://www.amonational.com/>http://www.amonational.com/</a> These people have tons-o-AMC knowledge. Someone should be able to tell you the model of that transmission. Then you can find if the correct output and/or tail housing is available or not.
Could also try searching google or yahoo for other AMC sites.
You didn't really ask... but ummm... if OD is your main objective and you don't wheel hard or run big tires, you could swap in a T-5 and D300 from a later model Jeep CJ. These are decent transmissions for med to light duty use and are commonly available. I have a T-5/D300 (shameless plug). Further, if that 4spd in your Jeep is OE... might be a T-18. These are desirable transmissions and could be quickly sold, likely for more than what you would pay for a T-5/D300 combo.