I went and picked up a back seat full of parts from a guy and was checking out his 71 FJ40 with a 6BT engine. Is was shoe horned in there for sure but it looked good. It was mated to an NV4500/NP205 with full length Corp 14 in the back and Dana 60 in the front. 37" tires on Hum-v wheels. He is not on any forums and has never posted pics online. He told me this was very rare and only heard of one other 40 with a 6BT. I really don't know anything about the diesel stuff or if an FJ40 and 6BT are rare or not, but his rig looked good. One funny thing about it was the rear driveshaft......the tube was only about 2" long