Hub problem after track day

[nzer]

I haven't been driving my car much since a recent track day - but i've noticed a mean knocking coming from the back when you change between going back and forward. So i whipped off the rear wheels and had a look.. well - the right hand hub is able to move some degree around its drive axle - does anyone have a detailed diagram - could it have sheared a few splines?

pic - if i hold the middle bit.. I can move the disc around hub around it a few degrees.. it makes the same knocking sound. I would have thought the wheel bolts would have stopped that movement - so maybe the knocking is coming from inside the hub.

any ideas?

thanks

[surebimmer]

Got any wheel bearing type noise going on? If the bearing is shot there would be your play.

[nando]

I bet it's the bearing. mine are shot too, and I also have a knock noise under certain transistions. Mine will be replaced this month, hopefully that noise will go away and my car will be quieter :)

[nzer]

Got any wheel bearing type noise going on? If the bearing is shot there would be your play.

no grinding noise if thats what you mean - everything is pretty new on the car, its only done 2700 miles now since it was built.