Losi Baja Rey HD Diff Housing & Internals. This is the replacement Baja Rey HD diff. This differential is used in the front gear box, but when the rear locker (LOS232011) is added, can be used in the rear as well. Package includes replacement diff cup, internal diff gears, hardware and gaskets. Ring gear (LOS232008), outdrives (LOS232013) and bearings (LOSA6987) not included.