A fleet of one ton route vans I used to work on converted over to the 4BT years ago. They had a lot of vibration, were noisy, smoky & sluggish. They finally got rid of them & went to the 6.2 -6.5 v-8 deisels. Thats why you see them floating around for sale. I would look at the v-8,s. They are almost a drop in replacement for a small block v-8.
