'91 Troopers have an Isuzu 12-bolt (12 ring gear bolts) rear end that has a removeable third member & usually came with 4.56 gears. This same rear but with 4.10 gears was used in '88-'95 Isuzu 2wd pickups powered by the 2.6 4cyl engine, the 4.10 third member is a direct bolt-in to the Trooper rear. The donor must be that particular engine & 2wd, other 2wd & 4wd Isuzu pickups of that era had different engines & rears that won't interchange or have the wrong gear ratio. There were never any 3.73 gears available for the Isuzu 12-bolt, only 4.10, 4.30, 4.56 & 4.77 ratios. A good clutch-type LSD was an option, look for code G80 on the firewall option plate, they were more common in Troopers than pickups, so the LSD carrier may need swapped to the desired gear ratio rear.
Edit: the Trooper rear is 58" WMS-WMS, your LUV rear is 54".
_________________ '78 Chevy LUV,1.9,4sp,headers,31's,SAS Dana 30,Dana 20,SOA rear w/Aussie Locker, rough body, bought new 12/4/78. '87 Trooper,2.3,5sp,headers,31's,ball joint flip & spacer,Aussie Locker rear,Superwinch hubs,brush guard w/5.5K winch,more to come.
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