Ford 4R100 Raybestos GPZ Transmission Master Rebuild Kit 1998-UP Level 2 This rebuild kit includes the Raybestos GPZ Friction Clutches, Steel Plates, Sealing Rings, Metal Clad Seals, Gaskets, Orings, Pistons, Rubber Piston Seals This Transmission Kit is one we sell everyday to Transmission Shops, it fits the 4R100 1998-On 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 Clutches made by Raybestos and Gasket Sets Mfg by Precision.