Deisel swap
I had a TJ and tried to price out everything myself that I thought I needed and I might have needed and got to around 8-10 grand without labor. That's with some used and some new parts. 4BT is a very popular engine and it can fit in almost everything and can make quite a bit of power. For a used your going to pay anywhere from 2-5 grand depending on where you are and who you know. Diesel swap is on my bucket list and I will get it done but good luck to you.
The kit they are releasing is for 99 and older tjs. More may come later. They are 50 state emission legal swaps so don't think you'll be seeing a jk kit any time soon, the diesel regs got much harder in 2000s.
https://www.youtube.com/watch?v=8Y8CeYfo9kc


