Ball parking it off of the back burner stats and a napkin
depending on the state of tune of the engine and the year of it (the rangie had quite a few different power ratings and weights over the years)
rough guestimate is about 40HP/T for the really early models with the carbied 3.5 through to something like 55hp/t for the early injected models.
the injected 3.9 at a guess brings you in at the 60-65HP/T mark.
and thats loosely based on a new engine and the tare of the vehicle NOT the GVM.... If you want it at GVM take about 30% out of those numbers. (the base vehicle weight is about 2/3rds of the GVM)
