When in 2wd my front driveshaft spins freely. When I switch from 2wd to 4wd the front driveshaft won't spin freely so I know the transfer case is working but won't engage the front diff. Is there an electronic actuator that engages the front different cause while in 4x4 and front tires off the ground. If I spin one of the front tires...the other side doesn't do anything. When I bought it used. The guy told me that it was stuck in 4x4 but he fixed it. I'm wondering if he disconnected something.
The Selectable Four Wheel Drive (S4WD) Front Axle consist of the following components:
• Differential Carrier Housing
• Differential Case Assembly
• Inner Axle Shaft
• Intermediate Shaft Bearing Assembly (located on the right side of the oil pan)
• Electric Motor Actuator
The front axle on Selectable Four Wheel Drive (S4WD) model vehicles uses a disconnect feature mounted on the right side of the oil pan 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 from the clutch fork outer gear that is splined to the right side wheel drive shaft to the clutch fork inner gear that is splined to the inner axle shaft. The locking of the two gears 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 wheel drive shafts are completely flexible assemblies consisting of inner and outer constant velocity CV joints protected by thermoplastic boots and connected by a wheel drive shaft.
How To Install Repair Replace 4x4 Front Axle Actuator Chevy Trailblazer...
SOURCE: 1999 GMC Sierra 4WD -
Hi,
The most common problem with this is the clutch packs in the transfer case, they sound like like are not locking up the front diffs properly and may need to be adjusted or replaced.
You need to do a pressure test of the fluid transfer section to ensure that there is the correct pressure to engage the clutch packs then if thats ok start to look at adjusting these.
Let me know if you need more infromation.
Thanks
Jason
SOURCE: 4wd not working replaced actuator when i press
Sure sounds like the vacuum switch is not working properly. You have done exactly what I would have done, start with the actuator(most common problem) and go from there. If your not getting the vacuum , then most likely the vacuum switch is your problem.
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