Quote:
Originally Posted by ziggy1969
2001 Chev Silverado with 4x4 electronic dash switch (build codes NP8/W30) - piled up the front differential really bad. We replaced the front diff from an autowrecker used and appears to be working OK... well almost, hence the question today
Symptoms are, when the 4x4 is set to 4Hi the front diff is spinning front tires on ice only. When in deep snow, the front tires do NOT spin.
Testing:
I jacked up the front right tire ONLY, and did the following tests
- 4x4 set to 2Hi, the tire spins freely by hand
- 4x4 set to 4Hi, the tire does NOT rotate freely and seems to be engaged now, but can still rotate very slowly by hand, however with great resistance. Remember, the other 3 tires are firmly on the ground. I would have expected to NOT be able to rotate the tire whatsover
Was told this is a result of faulty clutches slipping in the transfer case (as this is equipped with 4WD Auto)
Another guy tells me the actuator is not fully engaging
one is cheaper to fix than the other, any suggestions ?
is it the faulty actuator or faulty transfer case ?
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you say in 4x4 hi the right front wheel you can rotate by hand ???? that would mean the transfer case needs work. when the vehicle is operated on dry pavement in 4X4 this wears out the clutches. when the fluid is checked and its very dark/black this is the clutch material. actuator does not have a gradual type of engagement its in or out. auto 4WD is 2WD unless the speed sensors are showing different speeds then its in locked 4wd ... then it will auto back to 2WD. in auto 4WD the front axle actuator is engaged. the encoder is NOT until a slip is reported. encoder connects the front to rear axles the encoder creates / engages 4 wd... normally in auto 4WD the front axles should be not connected together ..when it 4wd on solid pavement you should feel the vehicle hop when turning hard at slow speed less than 2 MPH ..
if the encoder/actuators are bad you will get service 4WD error.