BD’s design deflects the oil back onto the ring gear and into the pinion
gear for cooler longer life. Other differential covers are large and bulky
resulting in lubricating oil being flung off the ring gear causing addition
heat and/or wear.

Ford (1989-up) with Sterling #12-10.25 or 10.5 single rear wheel
differential
Engineered cover design keeps oil on the gears
Deflects oil back onto the ring gear and into the pinion gear for cooler
longer life
Extra capacity sump located at bottom for gears to pick up oil
Internal and external cooling fins
Stainless steel allen head cap bolts, fill plug
Magnetic drain plug
Gasketless cover has integral re-usable Viton O-Ring