Ford 7L1Z-3B437-A Front Axle Shaft

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The described rear axle assembly is a hypoid, semi-floating type.

In 4WD models, there is a fully independent front axle assembly.

For these models, additional steps include removing the rear driveshaft and driveaxles, spare tire, differential vent hose, and vehicle speed sensor connector.

To remove the axleshaft, you push the outer (flanged) end of the axleshaft in and remove the C-lock from the inner end of the shaft. Then, you withdraw the axleshaft, being careful not to damage the oil seal in the end of the axle housing as the splined end of the axleshaft passes through it.

Remove the lower mounting bolts securing the rear shocks to the axle.

After removing the front skid plate, the front driveshaft needs to be disconnected.

The axle should be refilled with the correct quantity and grade of lubricant.

Use a puller tool to push the driveaxle out of the hub, and then raise the lower end of the knuckle outward for clearance before driving the inner end of the driveaxle out of the differential.

If the vehicle is equipped with air suspension, turn off the air suspension system. The switch is located in the area of the right kick panel. Loosen the wheel lug nuts, raise the front of the vehicle and support it securely on jackstands placed under the frame. Block the rear wheels to keep the vehicle from rolling off the stands. Remove the front wheels. Remove the front driveshaft. Disconnect the front driveaxles from the axleshaft flanges. Disconnect the vacuum lines from the vacuum shift motor. Disconnect the vent hose from the front axle tube. On 2005 and later Expedition/Navigator models, remove the four bolts and remove the front crossmember. Position a jack under the front axle differential case. Remove the front carrier bushing bolts. Remove the four front differential support bolts. Remove the front differential support. Remove the right axle tube bushing bolt. Remove the differential cover bushing bolt. Installation is the reverse of removal. Be sure to tighten all fasteners securely.

Loosen the wheel lug nuts, raise the front of the vehicle, and support it with jackstands under the frame while blocking the rear wheels.

The rear axle assembly in most models is a hypoid, semi-floating type.

Be sure to use a new driveaxle/hub nut.

If the vehicle is equipped with air suspension, you should turn off the air suspension system. The switch for this is located behind the right kick panel.

After completing the additional steps, support the differential with a floor jack, remove the differential's nuts and front torque arm bolt, and move it forward to clear the studs before carefully lowering it.

Remove the front differential support.