Originally Posted by tkilby
Most of the straight cut planetaries have 9310 gears which are softer gears to absorb impact for drag racing. IMO, they would not be suitable in a street application. Again, IMO.
9310 is what is used in a "Pro Gear" ring & pinion set which is not recommended for street use. But after doing some more research, I found that in some of the high end manual transmissions street and race 9310 gears are used. So, in other words I don't know.