A vehicle may include a body, a closure member, a hinge assembly and a sleeve. The body may define a cavity having an opening. The closure member may be movable relative to the cavity to provide access to the cavity. The hinge assembly may be attached to the body and the closure member and may include first and second torsion rods extending between first and second sides of the opening of the cavity. The first and second torsion rods may urge the closure member toward an open position. The sleeve may be attached to the first torsion rod and may include an outer surface having a profile defining a plurality of peaks and valleys. The outer surface may contact the second torsion bar to prevent direct contact between the first and second torsion rods.