I've been very happy with my 3.0 M.T. Only things that break are what "I" broke.
I might add as Russel pointed out there was only 2 years of the SWB V6 in N.A. , but the up side is many many parts from Montero Sports, Gen1 LWB, Gen 2 LS and SR - can be added to 3.0 SWB for upgrades. You can't beat the 3.0's V5MT 1 for toughness, although parts for Mitsu MTs might be hard to get.

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.