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Hi, just aquired this 12 bolt. Its supposed to be from 1971 Nova. Looks like BS code on axel tube. Date code looks pretty rough. Can the correct application for this rearend be found in numbers available on it. Thanks, Jeff
 

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You might want to check O.A.L. of the rear to see what year it fits. 1971 was last year of the 12 bolt looks like. "BS" started in 1966 to 1971. 1970 seems to be different numbers?

Check your over all length to see what year it could be since the numbers are really not that clear.

Dave
 

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Hi, just aquired this 12 bolt. Its supposed to be from 1971 Nova. Looks like BS code on axel tube. Date code looks pretty rough. Can the correct application for this rearend be found in numbers available on it. Thanks, Jeff
Multileaf = SS vehicle.
That's an original SS axle - cast #3969341.

My read of the code...

BS W245 2 E (the '5' is questionable might be a 7)

Interpretation from Alan Colvin (Chevy by the Numbers)...

BS = 1971 Posi 3.31:1
W = Plant = Warren MI
245th day of production
2 = 2nd shift
E = Eaton = posi source

(If you dig deeper and find there are three letters in the prefix, It's a 1970 axle = CBS)
 
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