look up the islamabad jeep. http://ijc.8m.com/ <there
what they do is pretty amazing, they build TJ's from CJ's, etc. and most of their jeeps seem to run toyota turbo diesels. not sure of their availability in america... but those guys really love them there... toyota is a good name. anyway the pictures of their swaps look clean.
Engine Toyota B2 3000cc 4 Cyl
im in love with the idea of a diesel jeep, but i dont have the guts to try the swap.