2015-2019 GM Duramax 6.6L LML L5P - BD's 2-Low Unloc Differential Kit allows the operator to disable the front wheel drive mechanism while full torque is available to the rear wheels. This allows sharp full-lock turns without the front axles hopping or binding.
BD's Cast To Cool AA14-11.5 rear differential cover fits 2003-2018 Dodge Cummins 5.9/6.7L and 2001-2018 GMC/Chevy Duramax 6.6L diesels. 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.