If you click on my pic there's a few good pics of a 38 1 1/2 ton chassis. 20" 10 lug wheels for sure and the rearends at least double the size of my modern 1 1/2 ton truck.There is a little thumb button on my shifter but it goes into the tranny,you have to push it down to get the truck in reverse.I was able to get all new brake parts without much trouble,the e-brake cables were the hardest to find.