I found a set of gears for the lt1 camaro. How do i know the ratio just from looking at them?

 

The rearend gear ratio refers to the relationship between the ring gear and the pinion gear. By dividing the ring gear tooth count by the pinion gear tooth count, the ratio is determined. For example, divide a ring gear with 41 teeth by a pinion gear with 10 teeth, gear ratio is 4.10:1 (41/10 = 4.10).

 

2.73's - 41 / 15
3.23's - 42 / 13
3.42's - 41 / 12
3.73's - 41 / 11
3.90's - 43 / 11
4.10's - 41 / 10 (as stated)
4.11's - 39 / 9

Those are the common ones .