742 Case 8.75" 4.89 Sure Grip Pumpkin 3.23

Probably not a 10 tooth pinion…….You would need 48.8 (or 48.9) ring gear teeth for that ratio.

9 pinion and 44 ring gear teeth would give you a 4.8888888 ratio.

That may be where the 4.89 comes from, after rounding up.

If you do have 10 pinion teeth, the ratio would have to have a "0" in the hundredths column i.e. 4.10 or 4.50 or 3.90