oooooh man, i thought you were onto it ! the 4HE1 was never in a trooper or any variant, way too big an engine,,,, the guys on ebay are suspiciously located on florida so i am thinking import,,, i am trying to figure out what this came out of but i am leaning to a medium duty bus,,, i know the HIGER company used these engines in buses and a full time single speed 4x4 was a production for over the road adverse condition delivery vans in the country.