Gear-X Final Drive units for the D-series engine meet or exceed OEM specifications and are fully tested in house, both in our workshop and out on the track before being released for general sale. We've been evaluating these final drive kits in various D-series transmissions and engine configurations for most of 2008 and are ready to offer them to our customers. With our feedback, Gear-X has been able to offer a wide spectrum of ratios to suit either road race, turbo/forced induction, drag race and rally race. These final drive units are offered for the D15B, D16A SOHC cable transmission and hydro transmission. Choose your weapon!