Question about 2002 Chevrolet TrailBlazer

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I have a chevy trailblazer and the 4x4 is not working. lights come on but the front wheels are not pulling.

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The Selectable Four Wheel Drive (S4WD) system uses an actuator located on the right side of the engine oil pan to engage and disengage the front drive axle. This actuator, or the mechanizm that it connects to is probably malfunctioning. If your light is coming on, most likely the problem is NOT in the transfer case.

Posted on Mar 12, 2011

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Anouther issiu if you hear a clicking sound they are known for breaking the shift fork in the front diff its made of aluiminum and iv replaced a few of these already
not as hard as you would think to change

Posted on Apr 17, 2011

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2 Answers

My 4x4 is not engaging on my 2004 Chevy trailblazer, any ideas?


Assume for an instant that the transfer case is actually working. The next area to check is the hub actuators or that the front hubs are actually engaging to drive the wheels. Remember it requires both hubs to be locked in for the 4x4 to work or else if only one hub is locked then the front diff will work and all the drive will be to the wheel that is not locked in
The cost to check is really cheap. just jack the front off the ground and see if both wheels are engaged . Do this by placing in 4x4 and have a friend hold a wheel while you turn the other wheel or try to turn the other wheel. BY holding one wheel ,if the hubs are locked in then you will not be able to turn your wheel. Ensure that the transmission is in gear as if you are driving the vehicle.

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1 Answer

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Does the shake match tire rotation or drive shaft rotation speed? If it's at tire rotation speed,have the new tires been dynamically balanced on a brand name motorized balancer?Re balance them that way.If a wheel weight has come off you will have a shake.You can also rotate the tires from front to back and see if that helps.Also,brake rotors can be out of balance and even with a perfectly balanced tire,the rotor can throw the balance off.

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the trailblazers are designed to shift from 2 wheel to AWD on the fly. BUT NOT TO EITHER OF THE 4 WHEEL OPTIONS. I'd suggest you get it to a mechanic to evaluate the damages.
Jer

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1 Answer

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