Dodge 68RFE Transmission Raybestos GPZ High Performance Less Steel Rebuild Kit 2007-On R72004CGPZ This kit has all Raybestos GPZ friction clutches, Bonded Pistons, Sealing Rings, Metal Clad Seals, Gaskets, O-rings & Rubber Piston Seals. Raybestos Powertrain GPZ 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 plates outstanding performance benefits are perfect for heavy duty vehicles and high-stress driving. Testing GPZ revolutionary friction material shows that it outperforms OE materials by as much as 20%. Plus, its performance improves as the power increases.