I brought home a '62 Rambler parts car and have begun disassembling it. The differential on the parts car has a tag on it that says 13/41. The car that I'm parting this one into (also a '62) has a tag on its differential, but it says 9/37. Are these tags gearing ratios? If so, can anyone explain them to me? Both cars are 196s with 3 speed OD transmissions. Thanks guys! - Justin