Hi, forgive me if this has been asked before. I have a 4.4SDV8 MY2019 AB. My car is currently at the dealers and they are struggling to find the issue with the rear of my FFRR.

In February I noticed that when pulling away, especially when cold, I would hear a knock sound as if something heavy was in the spare wheel well and rolling to the back left corner of the car. I checked for the offending article but found nothing. My local indy had a look and could not find anything. The noise has progressed to a knocking sound plus a vibration that can be felt through my seat which is definitely coming from that rear corner. When pulling away, especially when turning at the same time the car feels really unstable and just not right. Can anyone point me in the right direction please? 2019 Autobiography SDV8 Byron blue/black - current
2016 Vogue SE SDV8 Santorini Black/Ivory - sold
2009 RR Sport TDV8 HSE - sold

sounds similar to this - https://www.fullfatrr.com/forum/topic72256.html 1972 Series 3 full of character
1985 90 pick up went anywhere
1992 90 Exported
2007 L322 that was an experience
2010 D4 more versatile than a Swiss army knife, now gone
2011 L322 4.4 VSE traded in
2018 L405 4.4 VSE Sold a wrong un
2016 L405 4.4 AB

Thanks Andy, I have had the diff serviced and this made no difference. I will ask the dealer about a software update. 2019 Autobiography SDV8 Byron blue/black - current
2016 Vogue SE SDV8 Santorini Black/Ivory - sold
2009 RR Sport TDV8 HSE - sold

Get both rear wheels of the ground (handbrake off) and you should be able to spin one wheel and the other side should spin in the other direction. The rotation should be smooth all the way round.

If it isn’t , then that might point to a drive shaft or cv joint stiffness. V8 or else ...