DPI Performance Racing Products DPI1450p-31-1/4 9" Platinum Track Differential - 9" Ford 31 spline, 1/4 tight The all new pre-load design will withstand the punishment of today's horse power and technology advances. Unsurpassed quality and performance will take you to the winner's circle. At DPI we're committed to bringing you nothing but the best and it shows with our new Platinum Track The Black Gold has been redesigned and is now called the Platinum Track Differential. This all new pre-load design will withstand the punishments of todays horse power and technological advances Unsurpassed quality and performance will take you to the winners circle. The newly designed Platinum Track will leave the competition in the dust. Developed by racers, for racers - it is specifically engineered to hold-up under the most extreme conditions WHAT IS THE PLATINUM TRACK AND WHAT DOES IT DO? The Platinum Track is a torque bias gear driven differential, developed specifically for racing. It will allow you to go through the corners faster using less stagger