If it clicks but won't crank over, that is usually the solenoid. I've gone through a bunch of stock LUV starters over the years and I think I've only had one where the starter motor failed. Most of the ones I've had go out on me would start by clicking once every so often and then cranking on the next try. Even at the worst I could usually get the truck started by clicking the key to start repeatedly until it cranked, so you might try that and see what you find.
I have to say though, before you blame the starter make absolutely sure it isn't the battery or cables. Clean the connectors on the battery and the cables, and I think I'd get the battery load tested. It could read 12V or better on a voltmeter but not be able to put out enough amps to turn over a motor. If nothing else I'd want to see it start up another rig before I believed it was fine. Pulling the starter is a pain in the hindparts, and if it was me I'd be checking out everything else real well first
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95 Isuzu Trooper Daily Driver
86 Isuzu Trooper reliable backup
77 LUV 2wd stock beltway blaster (resting)
79 4x4 LUV project: 2.6L, 5spd, 31s (eventually)
MEPR: Man, my 4x4 makes all other LUVs look good
