4 Rear (Forward) GPZ 48RE, A618, 6 Forward (A518, A618, 47RE), Direct (A518, A618, 47RE, 48RE,) GPZ, 6 Overdrive Brake GPZ, 10 Overdrie Direct Tan (Must use with STMCHRY08 or STMCHRY08K) This Friction Kit is one we sell everyday to Transmission Shops, it fits the 2003-07 A618 /48RE 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.