S3 2007 Rapid Rumbling Noise (accelerate under load) diff/prop? HELP/ADVICE :(

S3DM

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Hey guys. Was wondering if anyone could shed some light. Here goes.

So I was driving back from Southampton last week and gave it a squirt off the slip road. Then all of a sudden upon acceleration In 4th the entire car begins to shake (quite violently) .... Got home. Diagnosed as a worn gearbox mount (top gearbox mount - engine was moving all over the place!). TPS - Main dealer part only.... Few days for a new one. Okey dokey.

Long story short I replaced the top mount which was failing and still this rumble/thump persists. It's pretty vile when exceeding 4/5k rpm.

From stand still 1st to 2nd is fine. No grumble. Any other gears that must hold more strain - rumble/thump/shaking car...

Are we thinking Diff issues ? Prop issues? Or is there something simple I'm missing?

Any help would be appreciated! Thanks Guys. Dan
 
Thanks for replying ! :) spoke to a specialist - said he'd never heard of the symptoms I'm experiencing :/. I'm thinking I may of damaged something (drivetrain) before replacing the gearbox mount as this allowed the engine/prop to shake around ... My monies on centre prop bearing which i am struggling to find anyone who sells this item :/
 
I thought it was the donut mount on my S3 causing this issue, had it replaced, problem still there. Not looked in to it further yet.