LOCK-RIGHT LOCKER DANA 30 Lock-Right locker for Dana Spicer 30 differential. This is a mechanically-operated unit which locks when power is applied, giving full power to both tires, and unlocks when you let off the gas. The Lock-Right unit installs into a standard open carrier, offering a lower cost alternative to full-carrier lockers. These units are not recommended for applications with high horsepower or large tires.