The D. P. I. Platinum Track Differential was specially developed for circle track racing. Uses no springs or clutches! Lightweight, under 15 lbs. The all new pre-load design will withstand the punishment of todays horsepower and technological advances. Unsurpassed quality and performance will take you to the Winner's Circle. The Platinum Track will leave the competition in the dust. Developed by racers, for racers, the new Platinum Track is specifially engineered to hold up under the most extreme conditions. The Gold-Trac Differential connects the axles to the ring gear with special spiral gears that sense which tire has the most resistance, and smoothly deliver power to that wheel. The wheel with the most traction receives the power in direct proportion to the amount of traction available.Pit Stop USA offers DPI Ford 9" Adjustable PlatinumTrack Differential - 31 Spline - 1/2 Tight 1450P-31-1/2 at low everyday prices. Be sure to check out all of our products from DPI Performance Racing Products including DPI Performance Racing Products DPI Gold Track and Platinum Track.