2001 1500 Z71 rear suspension clunk

[yakfish]

I've started to notice a clunking noise coming from under the bed somewhere. It will only clunk once until I reverse the truck and then start driving forward again, but not as soon as I being driving forward. Usually with in the first 10 to 20 seconds after I being driving forward. Doesn't seem to matter if I'm accelerating hard or going easy on it. Its a clunk you can feel. Any ideas?

[yakfish]

I have some additional info. I'm pretty sure its coming from the rear differential. I've been able to replicate the noise. It does it when making a left turn at slow speeds. Seems the limited slip is engaged and is sticking, disengaging with a bang. I think I'm going to try changing the diff fluid and hopefully that will remedy the problem.

[Swimmer8366]

Check the u joints too before getting too deep.

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[Motor City Rick]

DO NOT install any synthetic differential fluid, use what the owners manual / manufacturer states. Stepping outside what the manufacturer wants causes additional problems down the road.