So, I've been living vicariously through my friend. He's gone through 3 different diesels in his Bronco II. He started with a 4D55 w/ a 4D56 head. That was so gutless. So, he took the engine out and stroked it. Well, a little more power, but still gutless. So, I talked him into a 4bt. I'm telling you guys, that is sure one fun engine to drive. He's set up with a rotary VE 4bt, and HX30W turbo, M5R2 Tranny with an NP205 transfer case. He's got 33s with 3.27 gears. He also swapped out the axles to a Dana 35 and Ford 8.8 out of an explorer. I can't wait to get mine done! I was very surprised at how fast it is.
Now, here's my disclaimer...
I like diesels and I'm used to them. I've done my fair share of farming and ranching and driving big loud trucks. The 4bt is not a gas engine and is loud. As long as you soundproof the interior, it's not an issue. Vibration isn't bad either so long as you don't use just flat hard mounts and make sure the timing advance solenoid, ksb, is working properly on the VE pumps.
Anyway, I'll be back to work on mine sooner or later!