i have a 3rd gen and am in the middle of going through school to be a master diesel tech. Most of the replies to this thread are right. It will be a complicated conversion, especially if you don't know what youre doing and have no skills in it. I work with diesels everyday and am going to swap a 4bt turbo into my 3rd gen with a bigger lift and complete custom subframe. This will take time seeing that I work, go to school, and am raising my family, but when I start I will post a build thread so anybody interested can look. I'll prob end up doing the front and rear end out of a ford or chevy and most likely a bigger transmission from a ford/chevy with an adapter plate to bolt right up. I've done lots of research on the engine, the capabilities, the specs, etc. The information is out there if you're really interested, but it'll be a job for sure. Make sure you know what you're doing before you get into something like that. The 4bt will be about the only cummins you can put into your 4runner without doing lots of fabrication and having to move stuff around, But the 4bt is no joke. You can make those motors into a power house. The 4bt cummins turbo engine has more torque than a big block chevy.