jbtech
05-17-2022, 07:32 PM
This is an Original GM 12 bolt high impact ring and pinion also known as the "COPO" 4.56 gears.
The pinion is stamped with part number 3916231 dated 1/69
The ring is stamped with part number 3916230 dated 8/70
I believe as a set the part number is 3917973
Price is $500 shipped or best offer
The pinion is stamped with part number 3916231 dated 1/69
The ring is stamped with part number 3916230 dated 8/70
I believe as a set the part number is 3917973
Price is $500 shipped or best offer