Iv been told that the trucks where lower compression and had different pistons I dont know if that is fact or myth doenst make alot of sense to me why Chrysler would dumb down an already low performance engine for a truck seems to me the truck would need better performance. But that being said I know the new rams are lower the hp and torque ratings between the truck and cars with the same size engines. Maybe it's just on paper to make the cars (challengers and chargers) seem more high performance. Idk seems dumb to me tho.