Brake Supply offers  planetary gears, sun gears and differential ring and pinion gear sets that are proudly made in the USA and are guaranteed to meet or exceed OEM specifications. Brake Supply sun gears and planetary gears are manufactured for use in demanding environments found in mining industries around the world.  Our differential ring and pinion gears are sold as matched sets to assure proper fit and function.  We have stock available for the most popular Cat mining applications and offer same day shipping so we can get you back up and running FAST!