its actually FJ40, but the way to go about diesel powering a toyota truck would be to use the very robust, durable and available all over the world (except the poor US)--toyota 2.4L toyota 2L-T motor or one of the other diesel engines that came in a land cruiser from the factory (like the 3B). check out: 

http://www.off-road.com/tlc/body_styles/

for every body style and engine choices.

I'm going to be doing a FJ60 to diesel here fairly soon (winter more than likely)

sorry for no vanagon content--just spreading the werd.

mike