Frank Why would you want to do such a thing. Due to the weight of your car and adding any other transmission would be like going backwards in torque usage. Take the wheel diameter vs the alxe ratio vs the torque range of your engine and then lower the torque rpm range to what you would driving at and you have lost. You would be looking at corn fields outside of Topika and not using the over drive so that you could keep up with a Kia. Rodger & Gabby Colo Spgs '47 De Soto Custom w/Fluid Drive & passenger door mounted swamp cooler '63 Le Baron w/F-Sweep trunk lid & std A/C '66 Le Baron w/dual A/C & reverbed AM/FM '70 Overlander - InterNational