The casting date of G 13 3 indicates that the housing was cast on July 13,1973. Model changeover is usually the last week in july and parts are usually cast a week or two (sometimes more) before the car is assembled. This rear end could be either a late 1973 or an early 1974.
Now for the bad news! This rear will not bolt in to your 69 Firebird. The spring mounting pads are different.
You can make it fit by carefully grinding the welds off the spring perches and welding the 69 perches on the later rear end. This is no job for an amatuer, so I would suggest having it done at a good welding or machine shop. The perches need to be spaced and indexed accurately for the rear to fit in the springs properly.
Save your empty beer cans! The Japanese need 'em to make cars!
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Save your empty beer cans! The Japanese need 'em to make cars!
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