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There were about 23k miles on mine, but age can be a factor too (e.g. seals fail, rust in the bearings wears them faster, etc.). You should read the military's driveline studies. Shortly after the trucks came out, they were having issues with driveline vibrations ripping the back off the...

I cracked my block, because of the aforementioned driveline vibration. I swapped the engine myself too (just another 3116). The swap is straightforward, and completely documented in the manual, but took like 40 hours of work. You can get engines out of other scrapped FMTVs.