I have a truck w a bad motor and I have this used motor that I bought up in Oregon, represented as "good", whatever that means to the guy who sold it to me. Also supposed to have only about 150k miles, (would be like new if maintained properly and stock chip), but who knows?
The problem is that Diesel engines have a LOT of compression and will still run w reduced compression but with an obvious loss of torque and efficiency. I need to know actual numbers on this before dropping it into the truck, (a lot of work, unfortunately).
If it has ~300lbs, I tear it down and rebuild first. If it has ~400 lbs., (across the board of course), I drop it in. If it has ~500 lbs., I'll be screaming w joy that you can hear in San Diego.