S3 2007 vibrations at 2k rpm

aspire2010

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Hi chaps

Just looking for a quick bit of advice, my s3 when foot of the gas at about 40mph and starts to fall to around 2000rpm has this bad vibrating through the car, ive had a look the exhaust doeant look like its rubbing underneath and also its standard exhaust soo any ideas?

Also 2nd thing, when changing into 6th the movement into 6th is rather stiff where as all the other gears are totally smooth and can be pushed in with a finger, can this be gear linkages or is it likely to be sonething else considering its just had a gearbox, cluth and flywheel replaced?
 
I think I know this car I have sent you a pm on your other post over the panel gaps