Allison 1000/2000/2400 5 Speed Raybestos GPZ High Performance Master Transmission Rebuild Kit Fits: 2001-2005 This rebuild kit includes all of the High Performance Red Raybestos Friction Plates, Kolene Steel Plates, Sealing Rings, Metal Clad Seals, Gaskets, Orings, rubber Piston Seals, Bonded Pistons. This Transmission Kit is one we sell everyday to Transmission Shops 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 All these kits have GPZ Clutches Manufactured by Raybestos and Gasket Sets made by the Co. TRANSTEC