[neallewis]

Originally Posted by Martijn

Yes I replace the stock spur with a RW Racing one

The gears not the diff
When I hold the car off the ground and apply 1/4 throttle there is a scratching noise if I go higher in rpm then there less noise..

Btw,

here is a picture of the problem I got with the topshaft:


It's called 'pitting' I saw this at school

Ok. my topshaft wasn't worn like that, only the plastic idler had tooth wear.