vin number and gear ratio

Mustang Rear End Gear Ratios

SOLVED: Identify the gear ratio, circular pitch, base pitch, pitch diameters, pitch radius, center distance, addendum, dedendum, whole depth, clearance, outside diameters, and contact ratio of a gear set for a gear with parameters m=4 mm, 20 pressure angle. A 20-tooth pinion is meshed with a 40-tooth gear.

1957 Rear end ratio identification

Rear End Identification

How can I tell what my rear end gear ratio is?

3.73 Gear Ratio vs. 4.11 Gear Ratio (Comparison of Rear-End Gears) - All The Differences

Gear Ratio Calculator - Strange Engineering

rear end fluid recommendation?