Hello,The 1/2 Ton - 1-Ton Are The Same Beast.Cab,Fenders,Grill,Ect.The 1-1/2 And Larger Have Larger Fenders,Hood,Grill(some grill parts will work)The Cabs Are The Same,Except The Larger Trucks Have Metal Plates In The Front Of The Cab,For Strength.But Will Still Work.I Have Many Of These Trucks.To The Best Of My Knowledge This Info Is Correct,Feel Free To E-Mail With Any Questions.Thanks GMCJOHN