Fits GM Chevy 8L90 Transmission Raybestos Performance GPZ Friction Pack Module 2003-07 Raybestos® Powertrain GM 8L90 With GPZ Clutch Pack® Module contains upgraded friction components as well as friction component manufactured with the unique blend of GPZ high energy fibers for ultimate stress and high temperature durability. Recommended Use: Heavy-duty vehicles, commercial vehicles, and high-stress driving enhanced performance applications increased horsepower and torque Clutch Pack Components: 4 C1 Clutch GPZ, 3 C2 Clutch GPZ, 4 C3 Clutch GPZ, 5 C4 Clutch GPZ, 4 C5 Clutch GPZ 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.