So I have a 95 2wd with a good body and I have a 99 4wd with a **** body I'm thinking about swapping them my question is what all is involved from with swapping a obd1 body to a obd2 drive train can I just swap the wiring harness as well or is there more to it than that

 

Although I cannot offer the specifics of what you are asking, I can tell you that is going to be A LOT of work! If you are just looking for a project to work on for the heck of it, go for it... Otherwise you are going to have more time and money than the blazer is worth wrapped up in it. I would just spend 2K to find a decent bodied 4wd 99-01, part out the others and call it good...