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Anyone that is familiar with solid axle Toyotas knows that the factory Birfield joint is the weak link in their drive train. G2 Axle and Gear Birfield Axle Kits feature high-strength, chromoly-forged aftermarket components that exceed OE specifications to withstand the added load of your high-torque applications. They are designed to handle the added load resulting from oversized tires and locking differentials. These Birfield Axle kits are available with the stock 27 spline or 30 Big Spline option.