T90 trans to a 1990 4.2 (258)

[willy]

I need some answers I have a t90 Trans in my Willys truck...I want to drop in a 1990 AMC in line 6 cyl 4.2 Ltr. (258) will the T90 bolt right up to the bell housing on that motor?

[dunl]

Nope.  The T90 (in your case, the T90J from a truck) was never mated to AMC engines....these trannies were around long before AMC joined with Kaiser-Jeep in 1970.  There are no adaptors that I know of for this scenario.

However, you could get an adaptor for the T90 to fit other engines.  I would consider a Chevy 4.3 TBI or a Buick V6 like I have in mine....a 350 is nice for power but kind of overkill for this era of vehicle.

http://www.novak-adapt.com/knowledge/t90.htm

Poke around that link....it will give you not only answers, but also more questions to ask.