Hi, I began to notice some now and again clunk's coming from the rear end of my 2008 GS450h. Had the car MOT'd a couple of weeks ago and asked the mechanic to check it for me. He couldn't see anything specific, but he took a couple of photos around the differential area. When I expanded the photos, I could see the rubber diff mounting bushes were cracked. I got 2 new ones and had them fitted today. Both were totally finished, cracked and parted rubber. Runs like a dream again. So if you hear any clunk's from the rear, it might be worth checking these bushes.