1996 GMC Sierra Four wheel drive not ingaging

1996 GMC SIERRA
249,148 MILES • V8 • 4WD • AUTOMATIC
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LHBUILDERS
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When I push the button for the 4x4 the light only blinks and does not ingage, what could be the problem? I was told that 99% of the time, its the silanoid on the front axle, I replaced it and still doing the samething, not ingaging and light still blinking?
Feb 4, 2010 at 10:28 AM
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FACTORYJACK
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It will not mode shift from 2hi to 4hi, even in neutral at a stop? The actuator would have just giiven you no front axle, the transfer case would still select. It could be a faulty encoder motor. The thing to do would be to install a scan tool and view that the inputs are being requested. Is there a Service 4WD light, does it work at key on(is it non functional). Another thing to check with a scan tool, is if there are any transfer case codes.
Feb 4, 2010 at 11:11 PM