I was driving the car pretty hard in a rally recently and the following day I was driving normally and felt a kick/hesistation at about 40 mph as of I ran over a brick but nothing on the road.. car drove normal afterwards.. few days later after a short drive I started to hear a grind and then clunk at sub 10 mph speeds and almost felt like locking up up I parked car.. no Trans light or warning on dash, low engine oil light came on right before parking but didn't see any visible oil after parking.. here is the car in neutral going up flat bed. The car has every mod besides bigger turbos, have yet to see or hear of anyone with bad axle on these cars only the dreaded PDK failure. Car is a 2011 with 76k miles, petosin fluid change was done about 25k miles ago along with diff fluid change.

The hard clunking sound.

https://youtube.com/shorts/w3JNBNDVLHA?feature=share

 

Don't have enough experience to say I'd know what it is. Is the sound the same loudness from both sides of the car meaning the source is central like the transmission? Or is it more the front left as shown in the video? Hoping it's a wheel bearing (something cheap) vs transmission. Please let us know what your techs find.

 

Wheel bearings were changed about 15k miles ago so I doubt it is that. I am thinking CV axle or joint broken based on other cars I've owned and had similar sound, but those cars had a manual transmission.

 

the PDK is essentially a computer controlled manual transmission, it is not a slushbox

 

My guess, given the way the car jerks when it clunks, it is either an axle shaft joint, the pinion or ring gear, or one of the pinion or carrier bearings went out. Could also be the PDK, but they've actually been shown to be quite robust and outright catastrophic failures are kind of rare.

 

So far front differential is shot...waiting for full diagnosis

 

ouch