Previous owner overheated it for sure. He had the rad worked on several times and eventually that just blew.

Sooo...

Is it possible to do a ring job with the block in the truck? I don't really have the resources to pull the motor...

It doesn't drive horribly though. The only issue has been a bad idle. I took it to Moab last spring and got 21-22 mpg for the trip. That included driving over the continental divide twice...

I put a new rad in when I bought it. temp gauge stays pretty much at 1/3 even in 100 degrees.