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Hi there have noticed that when i am putting to much stress on the engine or right before i have to change down a gear there is a noise,like a klanging noise or like something is loose and rattling,and then when i have changed down a gear the noise goes??not sure if this is a good enough description so that you can have some idea of what it is but it is as good as i can.thanks for reading jayster

Might be a bad CV joint. I just changed one on my syncro that has been making a loud "clank" every time there is a speed difference between the gearbox and the wheel, like when starting, changing gears (one when i push the clutch and one when i realize it) or just doing a quick move on the gas.
Try pulling on your axles, the should move smoothly in and out with about 4cm (i think) of play. If there is a sound like grinding or a clonk it indicates you probably have a bad CV. It's not a very big job to fix, just a dirty one. It took me 15 minutes to get the axle out, 30 to get the old CV off and new one on to the axle and the 30 more to get that damned thing back on, that includes searching for tools i didn't even find.