Question about Chevrolet Silverado 1500

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I Have a 99 silverado that wont go into 2hi i can hear it underneath but then it doesnt click in but the light says its in 2hi when its still in 4

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The front acuater on the differential might not be pull off.

Posted on Aug 01, 2010

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When my 02 silverado 2500hd is in 4x4 the tires are locked and the truck won't move until I shift back to 2hi. Differential or Encoder Motor?


You can take this with a grain of salt but I am a junior in high school taking auto mechanics and my teacher use to work for a chevrolet dealership where they had a geo tracker come in because it would drive fine until placed in 4 wheel drive. Once placed in 4 wheel it would not move because front and rear differentials were geared differently from factory causing the wheels to lock up. If it has never been able to go into 4 wheel since you have owned it I hope this will help...

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My 97 Jimmy is shifted into 4hi and will not switch to 2hi, the lights flash and i hear a clicking but it wont shift


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Jul 31, 2009 | 1999 Chevrolet Silverado 1500

1 Answer

Why would all the lights come on my 4 wheel drive buttons about ten minutes after i start the truck


My 2003 Silverado has done this several times. This happens (at least on my truck) when I switch from any other mode to 2H when the truck is not moving. The front hubs are locked in the engaged position (actually, it locks inside the front differential) when in 4HI, 4LO, or Auto-Trac. When switching to 2HI, the front hubs try to unlock. The mechanism may bind, especially if they haven't been used for months, like during the summer, and don't completely move to the unlocked position. A switch tells the controller when unlocked, but doesn't always get triggered when the hubs don't get completely disengaged. Usually cycling between 2HI and Auto-Trac while driving will free up the hubs and make prevent the problem of all 4 lights coming on at once. Turning the engine off and then restarting it will usually correct the problem with all 4 lights lit at the same time by resetting the transfer case controller. Then, you will be able to switch from 2HI to Auto-Trac and back to 2HI while driving, as described above, to free up the mechanism. If this doesn't fix it, you will likely have to replace the switch in the front differential that tells when the hubs are completely disengaged, or, more likely, the motor that disengages the hubs/drive axles in the front diff.

Jul 16, 2009 | 2004 Chevrolet Silverado 2500HD

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