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1996 GMC Sierra Four wheel drive not ingaging

Tiny
LHBUILDERS
  • MEMBER
  • 1996 GMC SIERRA
  • V8
  • 4WD
  • AUTOMATIC
  • 249,148 MILES
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?
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Thursday, February 4th, 2010 AT 10:28 AM

1 Reply

Tiny
FACTORYJACK
  • MECHANIC
  • 4,159 POSTS
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.
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Thursday, February 4th, 2010 AT 11:11 PM

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