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That is normal for '72-'74 489 casting third-members.


Does the MS number on the gear tell the date?



no I'm pretty sure that number will match a number stamped on the stem of the pinion , pick that broken looking section and maybe you will be able to see it .

what concerns me is the part number on that gear , thats way to early a number to be a 489 gear ... I think ... I have a 3.55 gear set down stairs I can look at .



Thank you, if you can look at it that would be great. Any help appreciated.