In these pages we hope to help solve some of the more common ones
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This is a common problem on the GT4, and is generally caused by movement in the rear differential.
It is caused by a failure/breakdown of the stock differential mounting which has a large rubber bush in it. Over time this rubber slowly fails until it allows the differential to move creating the characteristic clunk
There is an excellent write-up on diff cushion replacement here on gtfours.co.uk