The DynaLoc™ is the latest innovation in locking hub design. These lock out hubs fit 1979-1991 GM trucks and 1979-1993 Dodge trucks with Dana 60 axles and 35 Spline axleshafts, and they will provide improved locking hub function, greater strength and a shorter profile for better clearance that reduces the chance of hub impacts on the trail.DynaLoc locking features and benefits: