Clunk noise from rear end

1997 GMC SIERRA
282,000 MILES • 5.7L • V8 • 4WD • AUTOMATIC
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JJAMES1230
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I have a noise that the best way to describe is a "clunk". When it happens it feels like the rear end is trying to lock up, because it propels you forward in the cab a little. It started after I changed the oil in it. There is also an almost dragging chain sound while driving. Do not know if the two are related.
Nov 6, 2016 at 5:17 PM
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KOOLCADDY6
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You might want to see if it requires a limited slip additive.
Nov 6, 2016 at 5:36 PM
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JJAMES1230
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I did that. Forgot to put that in with all the other information with my question.
Nov 7, 2016 at 5:36 AM
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STRAILER
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When you changed the oil did you see metal flakes in it? This could mean you have a bearing going out which will cause the differential to bind up and then release.

Please let us know

Best, Ken
Nov 12, 2016 at 12:42 PM
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JJAMES1230
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There were no metal flakes in it that I saw. But it was quite low now that I think about it. It didn't start doing this until I changed the oil.
Nov 12, 2016 at 7:07 PM
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STRAILER
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What kind of oil did you put back in it?
Nov 13, 2016 at 10:10 AM