There are four ways to find a ratio.
1 A dealer can normally tell from the vin number.
2 There are normally tags or labels on the axle that have part number, gear ratio, and fluid requirement
info.
3 You can count how many times you have to turn the driveshaft to get one complete turn of the tires.
4 You can divide the number of teeth on the ring gear and divide by number of teeth on the pinion.
P245/75 R16 Chevy stock size
The 2005 Chevrolet Silverado-2500HD has 16 valves.
The 2005 Chevrolet Silverado-1500 has a V6 engine.
The 2005 Chevrolet Silverado-1500 has 12 valves.
The 2005 Chevrolet Silverado-2500HD has a V8 engine.
The 2005 Chevrolet Silverado-2500HD has overhead valves (OHV).
The 2005 Chevrolet Silverado-1500 has overhead valves (OHV).
The 2005 Chevrolet Silverado-1500 is a gas-powered vehicle.
The 2005 Chevrolet Silverado-2500HD is a gas-powered vehicle.
The 2005 Chevrolet Silverado-1500 has a 5-speed manual.
The 2005 Chevrolet Silverado-2500HD has a 5-speed manual.
The height of the 2005 Chevrolet Silverado-1500 is 5 ft. 11.2 in. (71.2 in.).