Ford BT4Z-4K139-A Shaft Assembly - Rear Axle

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For rear drive axle removal on AWD models: Block the front wheels. Remove the rear wheel, wheel speed sensor, brake caliper, and brake disc. Remove the drive axle/hub nut. Use a drive hub remover to separate the drive axle from the wheel hub. On 2011 and later models, remove the hub and bearing assembly and rear knuckle. Pry out the inner end of the drive axle from the differential and remove it. For installation: Replace the spring clip. Apply grease to the seal area and insert the drive axle into the differential, ensuring the spring clip locks. Install the hub and bearing assembly, securing the drive axle with a new drive axle/hub nut. Tighten the nut with the brake applied, remove and discard it, then replace it with a new nut, tightening it promptly. Complete the installation, install the wheel, lower the vehicle, and tighten the lug nuts.

Depending on the model year and type of vehicle, drive axles may have different configurations: On 2014 and earlier models, the right-side drive axle connects to the intermediate shaft. On 2015-2018 models and 2019 FWD models, the right-side drive axle and intermediate shaft form a single unit with a retaining strap. On 2019 AWD models, the intermediate shaft is attached to the transfer case, and the right-side drive axle connects to it.