I'm having mine converted as we speak. The crossmember isn't that much different from the 5 speed. We ended up using a universal B and M cable shifter from Summit racing. It is a 3 speed shifter; I just need to add a switch for the OD IIRC. The rear driveshaft in my pickup had to be shortened and the front lengthened by a couple inches. The input splines are different from auto to manual on the TC.

83 mitsu flat bed 2.6l weber, 88 auto tranny, 2" body lift, 4.625 LSD, 235/85-16E mudders (33 x 9.50).