Last edited by JoshuasBMW; 07-06-2013 at 18:34.
Does the prop still go round when the wheels stop?
looks like the diff to me from what i can see but like stu says make sure you check everything first.
if you do suspect the diff to you could always remove the back plate off it to make sure everything inside is in good condition.
If the prop still spins then you're looking at from the diff back. going from the noise I'd say it's the diff. Just had a look on ebay and they range from £100 upwards so it's not a huge amount if you can fit it yourself..
I'll 3rd the diff as it sound like it's gone, I can see a prop flange spinning it does slow down at times tho.