Fabtech FTS22179, Installation Instructions Manual

- FIGURE 65 -

NOTE: Specific IWE “Integrated Wheel End” installation 
procedures are necessary when servicing and/or IWE 
vacuum is released. When the IWE actuator is loosened at 
the knuckle and/or removed from CV shaft:

•  Remove the two vacuum line, compress the IWE actuator 

and install a vacuum cap on the larger vacuum port (to 
keep it compressed).

•  Install the IWE actuator onto the halfshaft outer end (if 

removed).

•  Do not dislodge the IWE seal spring when installing 

an IWE on a CV halfshaft outboard end or component 
damage may occur. 

•  Allow the wheel knuckle to swing outward while keeping 

the halfshaft pushed inward. 

•  Once clearance is available, install the halfshaft outboard 

end into the wheel knuckle hub bearing.

•  Connect the upper ball joint and install new nut; torque to 

85 ft-lbs.

•  Install the three IWE actuator to wheel knuckle retaining 

bolts; torque to 106 ft-lbs

•  Remove the IWE vacuum cap and reconnect the vacuum 

tubes. 

•  Verify the spline engagement by checking for spline lash 

before installing the axle nut or component damage may 
occur. 

•  Install new axle nut; 30 ft-lbs

Procedure for checking proper 

installation of HUB actuator.

•  The IWE system uses vacuum hubs that engage the front 

wheel hubs to the front halfshafts or disengage the front 
wheel hubs from the front halfshafts. 

•  The IWE solenoid receives engine vacuum from the 

vacuum reservoir.

•   When the 4-wheel drive system is in 2WD mode, the 4x4 

module (PCM) supplies a ground path to the IWE solenoid 
to apply vacuum to the wheel ends (disengaging the front 
hubs from the front halfshafts). In 4WD mode, the 4x4 
module (PCM) does not supply the ground path to the 
IWE solenoid, vacuum is not applied to the integrated 
wheel ends and an internal spring keeps the front hubs 
engaged to the front halfshafts.

1.  With the vehicle on level ground. Engage the emergency 

brake and chalk the rear wheels. 

2.  Jack up the front driver side enough so the wheel/tire 

spins freely. 

3.  With the vehicle in PARK, start the engine. 

NOTE: MAKE 

SURE THE VEHICLE IS PLACED IN 2WD.

 Rotate the 

wheel/tire and check to see if the CV halfshaft rotates. If 
the CV halfshaft rotates, either a vacuum leak is present or 
the IWE (Intergrated Wheel End) was installed improperly. 

NOTE: DO NOT OPERATE THE VEHICLE OR DAMAGE 
WILL OCCUR. SEE FIGURE 56 

4.  If the CV halfshaft remains stationary when the wheel/tire 

is rotated repeat steps 1-3 on the front passenger wheel/
tire.

CV HALFSHAFT