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VW lupo odd grinding noise when revved

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Hi I've recently changed the clutch and release bearing on my lupo and no troubles except for when it revs over 3000rpm it makes a rotational grinding noise but quite faint. It makes this noise at all times so in neutral and when my foot is on the clutch, and when in gear unsure if it made it before I changed the clutch as bought it and only drove it once didn't really rev it too much. I've had it up on axle stands and put in second and given it a rev to see if the drive shaft vibrates but all smooth, any suggestions ? before I take the gear box out again to have a look as was a bit of a pig.

When removing the drive shaft on the drivers side I did take out the connection to the gear box as I'm stupid but got it back in but worried it could have been putting that back in. Also changed gear box oil 

Edited by Dan123423157
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Cheers mate and you know the part where the drive shaft connects to the gear box so you remove the 6 spline bolts and left with the bell like shape connection to the gearbox full of grease, inside that is an Allen key that I stupidly took out as I couldn't get the passenger side drive shaft out and thought it may connect, I found out that wasn't the case was just pretty stuck in on the passenger side 

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Oh. You may have broken your gearbox...

That bolt holds the diff flange (the bell shaped thing) attached to the diff cage inside the gearbox.

I think gearbox out again to check everything :(


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