There are two options.
1) Cable opertated clutch 5 spd from a 2.3L powered Trooper or Pickup
2) Hydro operated clutch from a 2.6L powered Trooper or Pickup
Option 1 is pretty straightforward to install. You have to rework the mounts and shorten the rear driveline but that is about it.
Option 2 means also reworking the clutch pedal, adding a master cylinder, lines, and slave cylinder, and so forth. However, the trans is a bit stronger and has some options available for other stuff like extra low transfer case gears if you are into crawling.
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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
