S3 8P 2009 02Q Whining on all gears.

Robbz89

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Hi!

I recently drove pretty hard and missed a shift at over 6k RPM and since then its been sounding like straight cut gears (reverse) even when
going forward on all 6 gears, its not loud but its there and its both annoying and scary if something might give up eventually.

A couple months ago i did swap the fluid in the front diff, rear diff & gearbox to Redline Heavy Shockproof if that could have taken its toll on the gearbox
over time? I have used this oil in previous cars even Audis without problems though.

I drive very hard daily, 6-7k RPM and full boost every single time im in the car is normal.

It is slightly tuned about 320hp at the moment, i intend to go for about 400HP later when i can afford the upgrades and the tune.

The car runs perfect apart from this noise and the shifting is smooth with no problems, however i got a feeling i might want to get a second gearbox
and refurbish that one for when i upgrade my clutch later, maybe someone has tips for upgrading gearbox, i am a handy person with access to a good workshop
i can rebuild one myself and swap it later, did all the work myself so far on the car Timing Belt/Timing Chain/Intake Carbon Cleaning/Brakes/Oil Pickup Pipe/Cam Follower/Balance Shaft Freewheel etc.

There is no whining sound when accelerating standing still, or engaging the clutch while moving, only when the driveline is engaged.

Is this a normal problem with these gearboxes, and what has even happened you think?

I have already tried to shim the shaft at the front left wheel as seen in many videos, but there is no movement on that shaft i cant fit a single shim its solid.

Any tips you experienced guys can give would be amazing, thanks!
 
Anyone with experience on this? Either with my problem, or with upgrade options for these chars.