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4x4 operation

Old 01-01-2012, 12:21 PM
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Join Date: Nov 2011
Posts: 5
Default 4x4 operation

HI everyone, Happy New Year. So I have recently purchased a 1988 GMC pick up truck 4x4. I dont think the 4-wheel drive is working. When I shift into 4x4 low, I sometimes get a grinding noise. If I put it into neutral first and then shift it may not happen. Usually doesn't but I have heard it occasionally. When it does go into 4x4 low or high, it just doesn't seem to have the torque that I expect it should. How do I test it?

thanks for any suggestions.
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