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115k, it's not even broken in...
Have you replaced Harmonic Balancer Bolt with new revised bolt and torque?
That's the first thing to check when you get a 3.0.
The rest of the truck is pretty bullit proof, 'cepten' some rubber part age degradation as you just experienced,,,but you''l find if your in a roadsalt and low ozone area most of your rubber bushing will even still be good.

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.