check which ratio your diffs have before you start swapping.
Check the tag on your firewall.
Some had 4.2 that year ( I think). Some are 4.36 to 1.
You might be able to put "bouncy seats into that LS from a 92-94 SR without much trouble.

dave h.
'89 Raider V6 5spd;Aisin Hubs;; Gen2 LS: frt. brakes, rear coils;U.C.arms;R.trailing arms;idler arm; rear LSD axle w.disc brakes ;2 battery system for Dog's fan; relocated ECU; custom bumpers;J.Baker receiver;Conferr roofrack; t-bar crank.