TransGo Lockup Repair Conversion Kit Ford 4R100 Firmer Lock-up Kit. 4R100-LU. Fits Ford E4OD/4R100 1997-2004 PWM (Pulse Width Modulated) lock-up pump assembly. Gas and Diesel Trucks. Includes New On/Off Valve assembly to replace OEM PWM valve assembly in pump. Converts long soft pulse (PWM) lock-up to short crisp On/Off lockup, with longer converter life. Convenient drop in valves, No special tooling or machining necessary! "Should be used in conjunction with SK E4OD Shift Kit, E4OD-HD2 Reprogramming Kit, or 4R100-HD2 Tugger Kit"