USA Standard Gear® sets the benchmark for quality OE replacement parts at affordable prices. USA Standard Gear produces the widest selection of aftermarket drivetrain replacement parts on the market, including ring and pinions, axles, Perfect Fit driveshafts, transmission and transfer case components, and installation kits. USA Standard Gear also offers performance parts in its Spartan Locker, the toughest lunchbox locker you can buy, and the Spartan Helical LSD positraction unit. Designed for the general installer and do-it-yourself customer, USA Standard Gear products provide unmatched reliability and the assurance that your vehicle is repaired for the long haul.