Grizzly Locker For GM 10.5 Inch 14 Bolt Truck Differential 30 Spline 14T 10.5 Inch GM 30 Spline Grizzly Locker ( Installs Into Std Carrier) Yukon Gear & AxleThe Yukon Grizzly Locker is the ultimate in mechanical locking differentials for street, off road, and drag racing. Grizzly Lockers provide 100 percent power to both tires, while still allowing for disengagement while negotiating turns. Everything about the Yukon Grizzly Locker is hardcore, its casing and gears, its advanced gear tooth design, and its impact on traction and performance. The Yukon Grizzly Locker is a mechanical positive locking