P2 planetary parts in stock Allison 1000 transmissions can occasionally be subject to snapping or spline stripping in response to intense horsepower situations, incorrect builds, and even shock loads. With our XCalliber performance billet p2 and c2 sets, you'll eliminate the possibility of breaking and snapping as these parts can withstand the most extreme uses. Sets include 6-pinion carriers for superior strength as well as modified mating splines for more points of contact. Offering 5- and 6-speed options, all of our XCalliber performance billet p2 and c2 sets are manufactured in the US. Browse below to keep your transmission running smoothly in high-horsepower situations!