The Aisin 4sp auto & t-case found behind the 2.6L 4ZE1 4cyl engines in '88-'91 Troopers will bolt to any Isuzu 4cyl gas engine. You will need a G180Z/G200Z auto flywheel, 4ZE1 flywheels have 8 crank bolts, not 6 like the G180Z. Since the Aisin tranny is considerably larger than your MSG-4 you'll likely have to either enlarge the tranny tunnel or lift the body or both, then adjust the length of both driveshafts.
_________________ '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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