from what I can see in "Chevrolet by the numbers" Vettered, you bought a 1972 Chevelle/Monte Carlo rear axle, 2.73:1 non-posi (KD)....built in Buffalo (C)...and (382)is supposed to be the day of the year but since there is only 365 days in a year maybe you read it wrong or maybe I'm just way off base here. There should also be another # after the 382 for the shift that day that produced it..good luck and lemme know.