Any further updates on the noise ? Mine is going into my local specialist this Thursday, so it would be good to be able to give them some pointers if you've had a result.
S/c coupling gives a rattling at tickover I think, maybe a knock at startup. But not when taking up drive.
How many miles on your car? If 50k +, then a gearbox oil change is a very good idea anyway.That’s cleared that up, thanks wilf! Just wondering if a transmission flush and oil change would help? I know some have said it solved the gear selector clunk which my car does occasionally
I rather think this might fall into the "if it ain't broke don't fix it" area.
I had a similar knock from a Jag (old XJ) diff in my old Cobra that was transmitting 500 BHP and lbs ft (regularly, lol) and it never gave any other issues, although I did change it when I wanted to alter the diff ratio.
Not the same diff I know, but essentially similar.
Yep, this is the way I'm leaning now too.Wait until it goes bang.
£2600 is a little less than mine cost, but that was main dealer pricing and under warranty, fortunately.
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Thanks for the info mate! Probably the same issue with my car so will forget about it unless it gets worse. I also looked at those diffs on eBay when I first suspected it could be the diff, seems a reasonable price. I wonder if he would discount if we both bought one 🤔So the guys spent a while under the car yesterday investigating everything that could possibly making this noise, and they've pinpointed the differential as the most probable cause.
There's no play in the propshaft as it exits the gearbox, there's no play in the drive shafts as they enter the hubs, there's nothing worn enough in the suspension bushes to make such a deep clunk, and as I reported earlier I'd noticed a small amount of play in the differential between the wheels moving and the propshaft turning.
The opinion of the two guys (who have over 25 years of Jag dealer experience between them and numerous years of independent experience) is that there is slightly more noise than they'd expect but it's certainly not a 'bad' noise yet. They could fit a new diff for around £2600 but they said this was a large amount of cash for something that they would probably ignore if it was one of their cars. I could run the car for another 10,000 miles and the noise might not get any worse so the choice is mine.
I have days where I don't notice the noise at all, but then I'll notice it once and start thinking about it, and then I'll notice it for the rest of the journey or until I get distracted ... ooo, doughnuts ...