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Old 05-19-2006, 04:28 PM
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Axle code ID, help to decode?

I need help tracking down an axle code from a 73 GM Impala

The stamping on the passenger side axle tube reads:

YAP058

I've had the cover off and discovered 2.73 gears which I believe to be original. Its a non-posi. The main concern I have is WHAT BLOODY AXLE IS IT? It has a 10-bolt cover with a 12-bolt carrier and an 8.875" ring gear.

The center casting numbers are a "G" in the lower left, either 80663 or 80633 in the lower right, and 8223 on the upper right. The upper left has the D/N code and mine is cast Dayshift.

Thanks.

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Old 05-21-2006, 03:59 PM
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YAP058

1973 GM Passenger vehicle rear axle (could also be a 1975)
YA = 2.73:1
P = Pontiac
058 = 58 day of 1973

Thats all the info I have, hope it helps.

406chevelle
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