Hi,
I installed ATS Final gear + AP2 secondary shaft.
Now I have a noise (fizz) that come from the gear. It isn't loud, but I have different opinion on it and how could be solved:
Someone told me that is normal due to different teeth configuration of the final gear.
Other told me that can be eliminated by using a different shim... to have the correct pre-load, infact the noise is due to a friction between part.

Where is truth? Could I solve the problem using the correct shim or is it a normal noise?

I don't want risk to break my gear.