when coming to a stop, and releasing the break there is a clunk coming from the back of the truck.

2004 CHEVROLET SILVERADO
110,000 MILES
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RAULRJ28
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i took my truck (2004 chevy silverado crew cab 5.3) to the dealership for service for a clunk noise when coming to a stop, and releasing the break there is a clunk. On my invoice it says "road test drive line causing noise 1.0 R&R drive line lube drive line with special lubricant noise is gone". the clunk came back after a few months, is this a easy fix or does anyone know the steps on how to fix this, i want to avoid going back to dealer and want do it myself,
thank you.
* they used GM lubricant 12345879
Jun 1, 2012 at 6:48 AM
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CARADIODOC
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I suspect you have a two-piece drive shaft and where they join in the middle is a splined slip shaft that allows it to change length as the rear suspension moves up and down. Most of that style have a grease fitting on the side to keep the splines lubricated so they can slide freely. When they bind, braking forces might put stress on it, then when the truck stops, those forces are gone and the stuck splines pop free and slide. That's what I'd look for on any other truck although that is not a common noise. GM is always experimenting with something new or different so there could be something else going on.

Unless someone tells me differently, my guess is there was nothing special about the grease your mechanic used. He probably listed the part number because that sounds better than "lubed drive shaft". If you do your own oil changes, grease fittings are common things that get missed. Even at the speedy lube places they often don't look in back for grease fittings, so perhaps it has just been neglected.
Jun 1, 2012 at 7:47 AM
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RAULRJ28
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@caradiodoc. thank you for the reply. I will look for a grease fitting to lubricate. Hopefully this will solve the problem. thanks again!
Jun 3, 2012 at 2:54 PM