If you have the muscle under the hood, then why not call it a muscle truck. To me it seems like the term muscle truck came around when the SS454 and the Lightening(that's a Ford)were around. Are they muscle trucks? Sure, why not. They have big power plants, fancy wheels and graphics. As far as the 67-72 goes. They were built waaay before the term "muscle truck". Same recipe applies. Hot motor, a little flash, and boom. Muscle Truck. The key factor is POWER.
