progress! use the senders (or lines) off the original old truck engine, since they match the gauges in the truck. You'll have to deal with the transmission crossmember, eh? the truck probably has a mount under the bellhousing, the new transmission needs one at the back of the trans. maybe you could swipe the crossmember from the van? think about the driveshaft...maybe the one from the van will work, might need to be shortened? how about the radiator, are the hoses on opposite sides? would the van radiator fit in the truck?