ok I have a 57 cj5 with a 283 and the t 90 tranny and stock twinstick t-case with warn overdrive. I have a newly rebuilt 150 out of my dads jeep since he went to a 4 spd. I was wondering if the tranny with mate up to the t-case? or do I need an adapter or what...any help would be appreciated.

the 150 is a 3 spd that was hooked to the model 20 transfer case which has some similarities to your spicer 18.you will have to find out the shaft size and spline of your output on the 90 also the length.see if it matchs the 150.Novak adapters has an excellent info part of their website that may help.isn't the 90 a 4spd?lower 1st gear?A/A has good info also.they show some retrofits on their site.