Clonk when in reverse

[brightspark1]

I have a 1998 Boxster.
When revering slowly on full lock, there is sometimes a quite a loud clonk or click, makes you jump,as though you could have hit something, any ideas !

[marky911]

My 964T does this and it's the limited slip diff.

Not sure if Boxsters have them though?

Like you say, there's a clonking from the rear when reversing on full lock. I get a bit of wheel-hop too. This is a rear wheel skipping due to everything winding up a bit at the rear.
All of this is perfectly normal. I just reverse on a wider arc to avoid it.

If your Boxster doesn't have a LSD then I've just wasted 30 seconds of your life, sorry.

[Pope]

+1 Wheel hop - the tyre sidewalls do't flex much so the tyre with the least grip loses contact on full lock and releases its built-up forces with a thud/clunk/bump

Another option: Early cars didn't have pad shims in the brake calipers - this means sometimes the pads 'clonk' up or down after a direction of travel change conincides with a brake application

[brightspark1]

Thanks, I NOW see I wrote 1998......... I did mean 2008 ! ! !
But I do now think due to the wide tyres, it is that that makes a sudden move, to make that sound. Great thanks alot.

[uknick]

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+1