Crunching sound

[unicorn]

While driving this morning I noticed that when accelerating it sounds fine but when I take my foot off the accelerator there is sort of a crunching rattle under the car towards the rear. Any ideas I'm thinking prop or diff just checked if there is oil in the diff and its full

[busheytrader]

Hi,

Does it behave the same in all the gears? Quiet in 4th gear but noisy in 3rd, 4th and 5th could indicate a gearbox issue.

Adam

[Stag76]

It could be the CV joint in the prop shaft.
When they are failing, they make a similar noise if under load at low speed.

Check if there is any rotational play in the joint.

[unicorn]

Thanks for the reply Adam no it was even doing it coasting out of gear. I managed to carefully limp home from the car show and had a good look and turns out it was the prop shaft the front end could virtually be pulled out and crunching. By the looks they cannot be repaired as it looks like a sealed unit not a universal joint I may be wrong though

[busheytrader]

When my propshaft was suspect Propshaft Services of Heathrow shortened a new old stock SD1 item they had on the shelf for a bargain price. They said the CV joints were non serviceable

[unicorn]

I thought they were non serviceable lucky I had a spare so all changed and drove 100 miles to cardigan ready for car show in the morning. Thanks for the info at least I know to bin it when I return home ( I'm a bit of a hoarder )

[FI Spyder]

I read somewhere that the \CV joint is the same one as the Mini CV joint (or maybe it was just the rubber). Anybody hear of this. It was on some forum so it doesn't mean it's true.

[Hasbeen]

Check it out before binning.

I know it is different in Oz, we tend to repair stuff as replacements, with the freight costs are higher here, but we have a company near here who will weld in a replacement CV, or replace it with a "PROPPER" UJ for a fraction of the cost of a new tail shaft.

Hasbeen