Here you can find information regarding repairs to the Ford Flex rear end system. These repairs include the
rear leaf spring, the rear differential system torque specs,
the rear diff fluid change procedures, and the axle driveshaft bearing removal and installation. All of these repairs and
procedures include in depth details on how to perform the replacement and or repair. They
also contain all the detailed torque specs needed for each bolt involved in the repair.
Rear Control Arm Installation
The rear Suspension is much the same as the front end except it does not have a steering component. With this said the rear suspension consists of an upper and lower control arm that
bolt to the frame and knuckle. The upper control arm on the back of this vehicle is also the toe link. It has 2 bolts which connects it to the frame and wheel knuckle. These bolts torque down to
111 ft-lbs and should be torqued when the vehicle is at ride height. The bolt which goes from the arm to the knuckle should be tightened to 148 ft-lbs.
As for the lower control arm it has a bolt and nut that holds it to the vehicle frame which can be torqued down to 159 ft-lbs. There is a bolt and nut that holds the arm to the wheel knuckle.
This bolt torques down to 196 ft-lbs.
Ford Flex Upper Control Arm to Frame Bolt Torque Specs : 111 ft-lbs
Ford Flex Upper Arm to Knuckle Torque Specs : 148 ft-lbs
Ford Flex Lower Arm to Frame Torque Specs : 159 ft-lbs
Ford Flex Lower Arm to Knuckle Torque Specs : 196 ft-lbs
Rear Wheel Hub Installation
The rear Wheel bearing and hub assembly is much the same as the front end consisting of an axle nut, the hub itself, and a braking system. To remove the old one you
must jack the vehicle up and remove the braking system to gain access at the wheel hub knuckle as the old hub will need to be pressed out and the new pressed in. You also need to remove
the center axle nut that holds the axle to the wheel hub. The
axle nut will need to be torqued down to 258 ft-lbs when reinstalled. There is also a wheel speed sensor that torques to 8 ft-lbs. After the axle nut is removed you can move to the upper and lower
ball joints and remove them so that the entire wheel knuckle assembly can be taken out of the vehicle. With it out you can use a press to press the old bearing and race out of the knuckle and then press
the new bearing in. Once the new bearing is installed you can reverse the process to finish the job. The upper and lower ball joint torque specs are provided above in the control arm and ball joint section.
Ford Flex Rear Axle Nut Torque Spec : 258 ft-lbs
Ford Flex Wheel Speed Sensor Torque Spec : 8 ft-lbs
Rear Differential Fluid change
The first step in replacing your rear end differential fluid is to jack the rear end of the vehicle up into the
air. Be sure to use safety precautions so that
no injuries occur. With the vehicle in the air you will have clear access to the rear differential. If you want
to check the current fluid level you can
pop off the rubber plug, if the level is full the fluid should be directly below the level of the plug. If it is
lower then your are currently low on fluid.
To replace the fluid inside the diff you must remove the plate and allow for the fluid inside to seep out. Be
sure to have a container to catch the fluid.
Once the fluid stops flowing you can reinstall the plate by using some silicone sealant to help prevent leakage.
The bolts for the plate should be torqued to 24 ft-lbs.
With the plate reinstalled you can now take your new fluid and fill the rear end up through the rubber plug
hole. Once done reinstall the plug and ensure that there are
no leaks.
Ford Flex Differential Cover Torque Specs : 24 ft-lbs
Rear Shock and Stabilizer Installation
To replace the rear shocks on a Ford Flex you will need to remove two sets of bolts/nuts. To do this you can jack up the vehicle and then
proceed to remove the upper and lower bolts on both sides shocks. The upper portion consists of a series of mounting nuts which hold the shock to the upper portion of the frame.
When tightening these nuts back up be sure to tighten them to 41 ft-lbs.
As for the lower shock bolt it is 129 ft-lbs. The rear end of this vehicle also contains a
stabilizer bar. The stabilizer bar has both bracket bolts and endlink bolts. The bracket bolts torque down to 41 ft-lbs while the endlinks torque to 41 ft-lbs.
