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Yukon Gear Zip Locker For Model 35 w/ 30 Spline Axles / 3.54+ - YZLM35-4-30 1979 Chevrolet K10 Suburban Scottsdale which feature a significant increaseThe Yukon Zip Locker is the latest in on demand traction. Its air operated design allows you to switch from an open differential to 100% lockup when you need it, giving you the ultimate in driver selectability. Zip Locker for AMC Model 35, 30 spline, 3. 54 and up. Yukon Zip Locker is an air operated locking differential that offers on demand traction. Features a forged case and 8620 internals for added strength. Includes carrier bearings M35 3. 54 &