Abstract: A replaceable mud flap system is provided including a rigid sleeve having a bottom face with a slot formed therein. The sleeve includes a hollow interior with a rectangular cross-section. An inboard end of the sleeve is perpendicularly coupled to a frame of a truck rearwardly of one of the tires thereof. An open outboard end allows communication with the hollow interior of the sleeve. An elastomeric flexible planar flap has a rigid guide coupled along a length thereof. The guide has a rectangular cross-section for being removably and slidably situated within the open outboard end of the sleeve such that the flap extends downwardly through the slot of the sleeve. An end cap is removably coupled to the outboard end of the sleeve for maintaining the flap within the sleeve.