The BowHouse RC TRX-4 Servo Winch & Bumper Mount replaces the stock front bumper mount and allows you install an internal or external spool servo winch. Internal spool winches install with the body of the servo between the frame rails, and external spool winches install with the body of the servo over the left side frame rail. Regardless of which style servo winch you use, the servo maintains a low profile along the chassis rails to allow clearance for a wide range of aftermarket bodies.