When driving along the car makes a sort of grating noise when the throttle is down , when I lift off it goes away, its not the throttle itself maybe drive shaft im not sure anyone had this ?

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1977 Clubman

I think we will need a bit of a better desciption..

Does the noise increase/match with engine revs? or is it a constant sound maintaining pitch and volume?

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Starlet Conversion:
http://www.ausmini.com/forums/viewtopic.php?t=15484

erm yeh increases but only when the car is moving, so I suppose as it goes faster not the actual revs sorry. i can rev it stationary and no sound ?i dont think its a wheel bearing as it sound mor central to the car - sort of under your feet area

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1977 Clubman

Does the steering start to get jerky and the steering wheel move on its own once you get past 30mph?

No

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1977 Clubman

If it's got rubber uni's check those for movement. Mine were so worn when I got the car, they were hitting the back of the gearbox! Thats my limited experience 2 cents worth.

maybe check around your drive shaft I had a peice of the radiator shroud fall of and onto the drive shaft Causing a Scarey rattle and grind at speed. check every where and anywhere that has anything to do with the drive shaft Or moving wheel Parts.