420 bull gear ratio's

[mikes420c]

When I tore down both of my final drives on my 420c, one side had the 63 tooth bull gear and 16 pinion gear combination, and the other side had the 55 tooth bull gear and the 14 pinion gear combination. I have a couple of old gears and was wondering which ratio works best for the 420c model?

[Lavoy]

420 below 125,000 used 63 and 16, above uses 14 and 55.
Lavoy