Call Randy's Ring & Pinion. We tried all gear types and all we're whinny and loud except one -
Yukon.
We used Richmond, Motive (the loudest) and others but all were not what we'd call "good cuts or perfect".
We ended up using a Yukon crown and pinion, the quietest we used by a country mile. We had everyone set up, sent a couple back and got them back exactly the same, with a loud & annoying noise. Of course there maybe a little run-in needed but everyone except Yukon sounded like a supercharger coming from the rear!
Strength wise they are fine, I can't feel or hear any weaknesses, not sure if you can or not though.
No grinding or clunking and it has taken some pretty hard launches from complete rests a lot.
