Ford 4R100 Transmission Raybestos Stage 1 Red Less Steel Raybestos Rebuild Kit 1998-On This rebuild kit includes all Raybestos Stage 1 Red Friction Clutches, 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 This kit is for the Non Mechanical Diode; 2001 and later Ford went to the mechanical diode drum which is a weak spot in the transmission and builders often choose especially on a performance build to revert back to the non diode style. If you are unsure which yours is the mechanical diode has 60 Teeth on the intermediate friction clutch where the non has 50 Tooth. This kit is set up for the non which is 50 Tooth. If you have any questions please feel free to contact us. Stage-1 About: Raybestos Stage-1 Performance frictions are an affordable solution for performance applications that may not require the capacity of the Gen2 Blue Plate Special, but do require a friction plate that can handle the demands that a stock tan or high energy plate cannot. Stage-1 frictions are not limited to performance, but also enhance heavy duty applications by increasing holding capacity, while being able to withstand higher temperatures associated with towing heavy loads. Raybestos Stage-1 Performance frictions are the best choice for street rods, tuner cars and mild street strip applications. 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 Manufactured by Raybestos and Gasket Sets made by TRANSTEC.