Regarding transfer case? Gl5 is fine. There are no synchros in there.

Gl5 in tranny... loss in shift quality. Best get a strict gl4. But based on the mileage it might not matter?

88 Montero, StarQuest turbo, Kormex 5speed +tuff-pan w/phoenix f. stage2 clutch, 4in lift+33' tires, 4.875 lsd, short-throw shifter, Aisin hubs, SR big brakes, gen2 uca's, elantra alt, and so much more... 16g turbo w/hardpipes + 4.90 locking disk-brake axle soon (maybe lsd or aussie front??)