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would a 79 g180 bolt up to a 81 g180. Are the clutch and tranny all interchangeable as well? Im rebuilding a g180 now and want to put it into a better lookin truck, mine is beat up.

It will work fine, direct bolt up.

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The only possible difference is in the clutch but it is minor. In 79 they used a smaller clutch disc so the flywheel is slightly different, the disc, and the pressure plate. In 80 the 4x4s got the larger disc, and in 81 2wd and 4wds got it. I think the release bearing is the same though, and the pilot bearing and shaft splines on the tranny are. Just don't try to mix disc/plate/flywheel parts between the two, and if possible go with the stuff from an 81 so you get the bigger clutch.

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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

do you suggest i swap the flywheel and cluctch from the 81 over to the 79 engine? Or leave it alone?

If they are the bigger and beefier size and in good shape, then it would probably be best to use them if you can.

The bigger 81 clutch would be better if you are replacing the clutch parts anyway. But, if you are doing things on a slim budget and putting a used clutch back in I'd just got for whichever looks to be in better shape. If the $$s are not a big deal, buy new parts for the larger clutch.

_________________
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