I would check all your starter related connections.
Both ends of:
battery cable to solenoid lug
jumper from solenoid to starter motor
chassis to battery
In addition to a dead spot on the winding, dodgy connections can cause intermittent cranking issues.
Four wheel drive allows you to get stuck
in places even more inaccessible.
62 88 Regular
67 109 6cyl NADA x2
74 Lightweight - The Antichrist
95 DI 5-speed
95 D90 5-speed
97 D1 Automatic