The Toyota factory service manual (FSM) has detailed frame dimensions for these truck. In my '84 manual the 2wd and 4wd frames are the same in almost all aspects except for the brackets and crossmember. Sorry my scanner is not functioning, otherwise I'd post a copy. There are a couple of FSMs online that you can find through links at the beginning of this forum section. -- Matt

'89 4runner SR5, 3.0, auto (fun)
'93 xtra cab, dlx,3.0, 5spd (work truck)