The 61000 Series PEM Sportsman Quick Change Gears are a high quality hobbed and fully heat treated 8620 steel gear. These gears are designed for use in late model, modifieds and 305 & 360 sprints. These are 10-spline gears for a wide range of compatibility with PEM, Winters, Frankland, Bulldog (DMI), Tiger, Halibrand, Jones, and other quick change rear ends. Multiple options ratio options are available.