Question about 2003 GMC Sierra 2500HD

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Switching in to 4wd on the fly get a loud clunk and some grinding

2003 GMC 2500HD. when i switch to 4wd on the fly and speed i get a loud clunk and a grinding noise. not sure if it is the transfer case motor or the front end actuator.

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  • jls53546 Feb 10, 2016

    I had to have the transfer case replaced. now it shifts smoothly

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Yeah i get the same thing when im hitting the whoops at 80 miles an hour.What is the deal with this.

Posted on Jan 23, 2009

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You are going waaayyy too fast to shift into 4x4 high. I found that going about 3 miles an hour helps it mesh perfectly. That might be too slow for what your doing, but does work without the clunk.

Posted on Jan 30, 2009

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