I have just bought a 2005 golf plus 2.0 gt tdi 6 speed manual with 97 k miles on the clock.

On selecting reverse gear and releasing the clutch i get a clunk as the gear engages. It may also happen selecting first gear but i am not too sure.
The car drives well apart from this.
I was thinking dmf possibly but i have heard that ther is another possible cause .

Any advice gratefully received