Question about GMC Sonoma
Since the noise appears only at load it means that the bearing supporting the front shaft is pretty much destroyed. There is no noise when there's no load because the few remaining ball from the bearing are still doing what they can to keep the shaft centered. When load is applied the balls are pushed aside and the shaft goes off center and starts to rattle in the bearing cage. The deviation of the shaft might be large enough to put sufficient pressure on the control fork forcing it to engage the 4x4 high.
The entire case has been severely damaged and your only reasonable action is to replace it.
I found a used transfer case foe $250.00 with 145,000 kms on it - that's an excellent price, get it and replace your own.
Posted on Jul 15, 2010
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Posted on Jan 02, 2017
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