The Dynaloc™ is the latest innovation in locking hub design. These lock out hubs fit 1978-1997 Ford F-250 and F-350 axles with 30-spline axleshafts. Dynaloc hubs 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: