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You have Isuzu corporate differentials, 8-bolt front, 10-bolt rear, 4.10 ratio. The only other ratio available for the front is 4.56, available in '84 through '87 gasoline powered Troopers. Both Trooper differentials will retrofit. New gears are not an option, even if you found them they would cost more than your truck is worth and would have to be mounted into your stock housings- even more expensive. Swapping in Trooper rears would give more power at the expense of mileage. The rear third member swap is simple, the front requires dropping the whole axle assembly.
23 mpg at 50 mph is excellent- you have to remember when these vehicles were built the oil embargo was in effect, the national speed limit was 55mph and all vehicles were designed to give adequate power and maximum efficiency at that speed, they were never intended to be driven at current interstate speeds, much less be fuel efficient at those speeds.
The 4x4 5-speed behind '86 & '87 2.3L pickups & Troopers could be swapped in with a few mods, but your smaller engine may not have enough power to use 5th gear at cruising speeds.
There are some engine adds available like cam, headers, 1.8 head on a 1.9 block & bigger carb, you might get 20% more power, and the later 2.3 or 2.6 engines can be installed and then modified further, but that's about it without a complete drivetrain replacement.
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'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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THE ENGINE IS FRESH REBUILD 30 OVER.
