Quoted:
No experience with the military version. I bought an 82 K5 with a 6.2, 700r4 and automatic hubs.
I put about 120,000 miles on it. Easy miles. Never hot rodded, pulled an aluminum 16' boat/trailer with it to the lake or the river sometimes.
The good....it never, ever got stuck, not in several feet of snow, not in the mud, not in the sand at the beach. I pulled cars, trucks, and other SUVs out of trouble anytime the weather was bad. It got good mileage. I could get 18 around town and 22 on the highway on a trip.
The bad....two 700r4's rebuilt, 5 starters, U joints every couple of years, 3 exhaust systems, a set of injectors, 3 injector pumps rebuilt, one water pump (that one wasn't bad, any water pump that lasts 160,000 miles is okay by me), the automatic hubs (one of them) broke, 3 sets of batteries, two broken rocker arm shafts, one rebuilt rear end, a couple of sets of glow plugs and the sensor and relay for the glow plugs and one paint job.
That thing wouldn't spin the rear tires on wet pavement but it would tear up the transmission, u-joints and rear end.
To be a little more objective about it. The 700r4's (early ones anyway) were pieces of crap. Had GM correctly rebuilt it when it was under warranty it might not have broken the second time. The second time it was out of warranty so I paid for the rebuild and the guy at the shop pointed out the stuff GM should have replaced when they rebuilt it the first time. He put the heavier duty parts in it and I never had any more problems with it. GM took advantage of me again with the first broken rocker arm shaft. I knew when I got it back it still wasn't right (plus they'd soaked me for set of injectors telling me mine were "weak" and needed replacement) and the next time it broke that rocker arm shaft I fixied it myself. Amazing what a broken valve spring will do to batter the crap out of a rocker arm shaft. No more issues after I found and replaced the broken spring on the #6 cylinder exhaust vavle.
I'll never have another diesel. The parts and maintenance repairs far outweighed the gas mileage increase. If I ever have another large SUV it'll be a gas engine. While the diesel may still be going strong at 180,000 miles (I've had gas engines with more miles on them) all the repairs and parts cost me enough to build and install a couple of gas engines.
M1A4ME, do you remember what gear ratio you had in yours? I've got an old 700r4(1989) my friend has access to that I may want to put into mine...