Selectable Four Wheel Drive (S4WD) Front Axle Description and Operation
The Selectable Four Wheel Drive (S4WD) Front Axle consist of the following
components:
• | Differential Carrier Housing |
• | Output Shafts (Left and Right Side) |
• | Inner Axle Shaft Housing |
• | Inner Axle Shaft (Right Side) |
• | Electric Motor Actuator |
The front axle on Selectable Four Wheel Drive model vehicles uses a
central disconnect feature in order to engage and disengage the front axle.
When the driver engages the 4WD system, the Transfer Case Control Module
sends a signal to the electric motor actuator to energize and extend the
plunger inside. The extended plunger moves the clutch fork and clutch fork
sleeve across the inner axle shaft and the clutch fork shaft and locks the
two shafts together. The locking of the two shafts allows the axle to operate
in the same manner as a semi-floating rear axle. A propeller shaft connects
the transfer case to the front axle. The differential carrier assembly uses
a conventional ring and pinion gear set to transmit the driving force of
the engine to the wheels. The open differential allows the wheels to turn
at different rates of speed while the axle continues to transmit the driving
force. This prevents tire scuffing when going around corners and premature
wear on internal axle parts. The ring and pinion set and the differential
are contained within the carrier. The axle identification number is located
on top of the differential carrier assembly or on a label on the bottom of
the right half of differential carrier assembly. The drive axles are completely
flexible assemblies consisting of inner and outer constant velocity CV joints
protected by thermoplastic boots and connected by a wheel drive shaft.
Full-Time Four Wheel Drive (F4WD) Front Axle Description and Operation
The Full-Time Four Wheel Drive (F4WD) Front Axle consist of the following
components:
• | Differential Carrier Housing |
• | Output Shaft (Left Side) |
• | Inner Axle Shaft Housing |
• | Inner Axle Shaft (Right Side) |
The front axle on Full-Time Four Wheel Drive model vehicles does not
have a central disconnect feature in order to engage and disengage the front
axle. The left and right axle shafts are connected directly to the differential
case assembly. This allows the axle shafts and the propeller shaft to spin
continuously. The transfer case controls the amount of torque applied to
the front axle. The remaining components are the same as the selectable four
wheel drive axle.