There isn't much online about Jeep postal vans, I have a 74-79 RHD van (owner doesn't know) that I can take parts off of. The owner says it's a 4cyl. Could it be the coveted Chevy 4cyl. found in the early Chevy II? They used them in the little DJs What about the rearend? Steering box? Does anybody know anything about these things?