Editing GM RPO build codes (section)
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==Rearend== The casting number is located on the right side near the prop shaft. Other codes are stamped into the axle tube. The date code is cast in drivers side of housing for the case of '63-'79. In straight axle '53 to '62 Corvettes, the identifier is stamped on the front right side. In the IRS, the assembly date is stamped in identifier on the bottom flange. Gear ratio Stamped in bottom flange as part of identifier as a letter code, such as AW. The 1963 to 1979 rear end housing has a casting date on the drivers side. Again, this is the case date code. The assembly date is stamped in the bottom of the case on the lip where the cover mates.
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