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Jupiterimages/Photos.com/Getty Images. A front axle boot, also known as a constant velocity (CV) boot, is a rubber cover that goes over the drive axle or CV joint on a car. The boot protects the joint and keeps grease used to lubricate the joint where it belongs, near the friction points.
Show example Axle Shaft Seal Replacement prices. The front axle shaft seal is what prevents the fluid in your differential from leaking out around the axle. The differential delivers engine power from your transmission to the wheels, and allows your wheels to move. Accordingly, it needs to be lubricated, as does your axle.