Allison 1000/2000/2400 Raybestos GPZ High Performance Deluxe Transmission Rebuild Kit Fits: 2001-09 This rebuild kit includes all of the High Performance GPZ Raybestos Friction Plates, Steel Plates, Sealing Rings, Metal Clad Seals, Gaskets, O-rings, rubber Piston Seals, Bonded Pistons, Oil Pan Filter, Spin on Filter, and pump bushing. Note: We will need to know the year of your Allison and if you have the deep or shallow oil pan to include the correct filter with your order. Please let us know at the time of purchase either in a message of call us. Stage-1 About: Raybestos Powertrain GPZ friction plates greatly increase transmission performance and durability. This state-of-the-art friction material far exceeds OE material to withstand high stress, high temperatures and repeated cycling. GPZ's outstanding performance benefits are perfect for heavy-duty vehicles and high-stress driving. Testing of GPZ revolutionary friction material shows that it outperforms OE materials by as much as 20%. Plus, its performance improves as the power increases. Advantages: Withstands high horsepower Greater torque capacity Maintains piston travel Optimum performance Higher heat resistance Smooth engagements Enhanced shift feel