The overdrive is a wonderful way to get highway speeds without a lot of trouble. A dear friend of mine, the late John Erb told me all about it and once I tried it, I was sold too. Its a shame they are so rare and hard to find. It bolts right up and its especially nice if you have 3 on the tree already. There cant be enough praise for those that came before us. John forgot more than I will ever know about these trucks. I spent a lot of time working with him and learning from him but as with everything else, time is not on our side!
