Need Help With Decoding My Transmission These Are The Numbers That Are On A Tag 448
71-cd-11671.

On the transmission,71 - CD - 448 - 11671
71 = year - 1971
CD = 400cid Chevelle or Monte Carlo, according to "Chevrolet by the numbers"
448 = julian date code - March 24, 1971
11671 = transmission serial number ..........................Don.