Ford 5L1Z-4K138-A Shaft Assembly

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A differential system causes the rear axle assembly to have different wheel speeds while cornering. There are splines on the shafts of the axle, which fit into the differential side gears. For example, drive axles in 4WD models have outer Constant Velocity (CV) joints and inner ones on both sides. An optional locking limited-slip rear axle is available for enhanced traction. When you think about axles as potential sources of noise, don't overlook others like road or tire sounds. This means that engine and transmission noises can also affect diagnosis of any axle issues.

You should disconnect the vacuum tube(s) at the rear of the IWE (Integrated Wheel End) hub, remove the IWE retainer-to-knuckle bolts, and disconnect the tie-rod end and upper ball joint from the steering knuckle.

Remove the front carrier bushing bolts.

For these models, you should also disconnect the rear axle track bar, remove the rubber jounce bumper, disconnect suspension upper and lower arms, and disconnect the lower shock absorbers.

The manufacturer recommends using a new pinion shaft lock bolt for installation. However, if one is not available, you should coat the threads with a non-hardening thread locking compound.

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

The first step in the installation process is to reverse the removal steps, starting with inserting the axleshaft.

Remove the front carrier bushing bolts.

After disconnecting other components, pull the steering knuckle outward while pushing inward on the driveaxle and use a special tool to pull the inner driveaxle CV joint away from the differential.

Lift the rear of the vehicle securely with jackstands under the frame.