Allison 1000/2000/2400 Raybestos GPZ High Performance Deluxe Transmission Rebuild Kit Fits: 2006-2010 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. 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