When Steve Dulcich built his Mopar Muscle Truck, some upgrades happened off camera, including a new rear end to replace the one Freiburger welded in the show, plus a set of traction bars, which sadly didn't work as expected.When Steve Dulcich built his Mopar Muscle Truck, some upgrades happened off camera, including a new rear end to replace the one Freiburger welded in the show, plus a set of traction bars, which sadly didn't work as expected.