Ford E7TZ-4234-B Shaft Assy - Rear Axle

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The rear axle assembly of a vehicle involves a longitudinal, thin-walled tubular housing that houses a differential and axleshafts, to support the vehicle's sprung weight by using vertical locations of the axle housings on the vehicle frame rails by means of its springs that can be coil, or a leaf spring type. Vehicles utilize two designs of rear axle assemblies: Semi-floating axleshafts and full-floating axleshafts with even more robust construction are other types of axleshafts. A full-floating axleshafts do not carry any of the vehicle mass, may be easily pulled off the tapered roller wheel bearings and are intended solely for power transmission to the rear wheels only. On the other hand, there are 'semi-floating' axleshafts which are parts of the rear wheel support system-they not only transfer power, but also carry part of the vehicle weight. In both designs hypoid gears are used with the pinion gear centre line being below that of the axleshaft centre line. Because of this, it is recommended that work on these models be restricted to specific uses, and for any repair or overhaul requirements, the axle assembly should be removed and brought to a rebuilder or exchanged with new or refurbished ones as buying individual axle parts for repair locally has become quite difficult. When replacing an axle unit, it is thus important that the unit be of the same type, as well as have the same gear ratio.

The rear axle assembly of a vehicle involves a longitudinal, thin-walled tubular housing that houses a differential and axleshafts, to support the vehicle's sprung weight by using vertical locations of the axle housings on the vehicle frame rails by means of its springs that can be coil, or a leaf spring type. Vehicles utilize two designs of rear axle assemblies: Semi-floating axleshafts and full-floating axleshafts with even more robust construction are other types of axleshafts. A full-floating axleshafts do not carry any of the vehicle mass, may be easily pulled off the tapered roller wheel bearings and are intended solely for power transmission to the rear wheels only. On the other hand, there are 'semi-floating' axleshafts which are parts of the rear wheel support system-they not only transfer power, but also carry part of the vehicle weight. In both designs hypoid gears are used with the pinion gear centre line being below that of the axleshaft centre line. Because of this, it is recommended that work on these models be restricted to specific uses, and for any repair or overhaul requirements, the axle assembly should be removed and brought to a rebuilder or exchanged with new or refurbished ones as buying individual axle parts for repair locally has become quite difficult. When replacing an axle unit, it is thus important that the unit be of the same type, as well as have the same gear ratio.

Use hypo id gear lubricant SAE 80 or 90, adding 2 oz. of Ford part No. EST-M2C118-A friction modifier for models with a front locking differential, and for those with a rear locking differential, use Ford part No. ESP-M2C154-A locking differential fluid along with 4 oz. of Ford part No. EST-M2C118-A friction modifier. The fluid level in the drive axles should be checked at each oil change, as the rear axle lacks a dipstick; instead, a filler plug is located in the side of the housing. To check the fluid level, ensure the transmission is in park or in gear, set the parking brake, and block the drive wheels. If necessary, raise the vehicle using jack stands to ensure it is level. Clean the area around the fill plug, remove it, and check that the gear oil is at the bottom of the fill hole, adding more lubricant if needed. For Traction-Lok limited-slip units, include 4 oz. of Ford Friction Modifier CBAZ-198546-A. Drain and refill the drive axle housings every 100,000 miles or after driving in high water. The best method for draining is to remove the axle housing cover, ensuring the oil is at normal operating temperature. If a drain plug is present, it can be serviced similarly to a manual transmission. To drain, drive the vehicle until the lubricant is warm, raise and support it if needed, and use a suction gun if no drain plug is available. Clean the area around the differential, position a drain pan, and loosen the housing cover bolts to allow the lubricant to drain. After draining, clean the gasket surfaces, install a new gasket and sealant on the housing cover, tighten the bolts in a crisscross pattern, and refill the drive axle housing with the appropriate lubricant before checking for leaks.

If a loss of fluid is observed, check the differential lubricant level and refill if required.

Detach the tracking bar from the axle assembly.

Lift out the differential pinion shaft to gain access to the axleshaft C-locks. Rotate the differential case 180 degrees and slide the pinion shaft out of the case until the stepped part of the shaft contacts the ring gear.

Remove the stub axle bearing retainer bolts.

The 44-IFS is on vehicles equipped with coil front springs, while the 44-IFS-HD and 50-IFS are on models equipped with leaf front springs.

Disconnect the sensor electrical connectors at the knuckles.

The Dana 44-IFS-HD is available on F250 4x4s.

Remove the brake lines from the clips that retain them to the axle but do not disconnect any of the line fittings.

Release the parking brake and remove the brake drum(s).

Raise and support the vehicle safely. Remove the wheel and tire assembly.

Test drive the vehicle and check for leaks.

Add lubricant until it is One-quarter in. (6 mm) below the bottom of the filler hole in the running position. Install the filler plug and tighten to 15-30 ft. lbs. (20-41 Nm).

The rear axle code may be found in two places on the vehicle.

Install the stub axle assembly into the axle housing and engage the differential side gear splines. Gently tap the assembly into the case until the bearing bottoms in the bore. Carefully tap the seal into the case until it seats evenly around the bore. Install the bearing retainer plate and bolts, tightening them to the torque.

Remove the driveshaft.