What are you looking for exactly Corey? Doesnt ORS make a standalone harness kit? why not just use that?
Or are you talking about mounts and stuff?
Best set up for tranny/t-case would either be a r151f (22rte turbo tranny) or, a tacoma r150f tranny with a t-case out of a 88-95 5spd 4runnner/pickup.
(the newer tranny has a nice tight short shift compared to the older one, i find). and the 88-95 t-case will keep it on the correct side.

89 4Runner
3" BL, M/T locks, 33"bfg mt, bilstein, Kayline, tubebumper, toyotafiberglass panels
TBI: Elocker,3.4 w/ORS,b+b,S2Sstg2cams,arias pistons,P+P intake,TRDs/c,URDpullies+7th,downey headers,MAPECU2,WEGO WB, SupraMAF,walboro255,stg4clutch, EPaOo2 sim