[Tom Goldman]

The 4.30 street gears go to the 3 series carrier, which is 4.10 and numerically lower ratios.
I have a customer who used to switch back and forth from 4.30's to 4.56's.
We machined the bearing shoulder on a 4 series spool and made a thick shim so we can use only one spool for both ratios.
Now Strange has a 4.30 Pro gear that fits the same spool as a 4.56