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Author Topic: 12 BOLT DATE CODES  (Read 2961 times)
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« on: March 22, 2006, 02:41:43 PM »


Does the date code on the axle tube need to the the same as the casting date on the carrier housing?  How far apart should they be?  I have a rear that has been rebuilt and I think the axle tubes have been replaced an restamped. 


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« Reply #1 on: March 23, 2006, 02:50:58 PM »

The casting date only refers to the date the iron center section was poured at the foundry; the stamped date on the RH axle tube is the date the axle assembly was completed (tubes, brakes, diff, etc.). Generally, the axle assembly date will be within 1-6 weeks after the casting date, but there are exceptions. The only "rule" is that the stamped assembly date must be after the center section casting date.

'69 Z/28
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« Reply #2 on: March 23, 2006, 02:58:30 PM »

Thanks JohnZ,

The date on the center section is B 7 8 and the axle tube is BU 0313.  I was told that it was a March 69 3.73 posi rear.
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« Reply #3 on: March 23, 2006, 07:23:17 PM »

B 7 8 - Feb 8, 1968

0313 - Mar 13th

I was told that it was a March 69 3.73 posi rear

Appears to be March 1968 in a 1968 car
« Last Edit: March 23, 2006, 07:25:55 PM by Z71 » Logged

Owned new (and still have stashed away) LOL
1966 Impala SS396
1970 Chevelle SS454
1972 El Camino SS350
1973 Chevelle SS350
2002 Trans Am WS6 Ram Air
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