200 4R Transmission 250-400 Horsepower Heavy Duty Red Line Band- the band has increased surface area, which provides better holding power. We accomplish this by getting the whole band surface lined with our Hi Pro friction material, alto clutches. We also install a heavy duty pump slide spring and HD pressure regulator spring. Heat treated stator support. Hi Tech Valve body kit. .500 boost valve. .296 Reverse boost valve. Heavy Duty Pressure regulator valve- Up Dated New thrust washers. New bearings. New Bushings.