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Odd one here guys, driving slowly, then accelerating I hear a metalic knock from the rear end!? Drive shaft/prop area at a guess... common; anything i should be looking at!?
T.I.A
 

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I've just encountered the same sound just recently. I get a knocking noise in the rear turning right when driving between 1-10 mph. I'm guessing it's the rear differential. I'm taking it to the dealer to get a diagnostic as soon as I get a chance.
 

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If it's still under warranty get it checked out bro. If not drop the oil from the diff first.. good luck
 

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Has there been work done to the car recently? Specifically anything that precipitates the removal of the exhaust and/or the differential skidplate? If not properly torqued, the skidplate bolts and the exhaust mount bolts into the body may allow the piece to shift under load changes. I had this problem and took me multiple times on a lift, driving with a friend, etc. to finally pinpoint it and fix it by re-torquing the bolts.
 
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