Author Topic: 12 BOLT DATE CODES  (Read 2976 times)

tyrfryrtom

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12 BOLT DATE CODES
« on: March 22, 2006, 07:41:43 PM »
Hello,

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. 

Thanks

Tom

JohnZ

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Re: 12 BOLT DATE CODES
« Reply #1 on: March 23, 2006, 07:50:58 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.
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tyrfryrtom

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Re: 12 BOLT DATE CODES
« Reply #2 on: March 23, 2006, 07:58:30 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.

Z71

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Re: 12 BOLT DATE CODES
« Reply #3 on: March 24, 2006, 12:23:17 AM »
B 7 8 - Feb 8, 1968

0313 - Mar 13th

Quote
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 24, 2006, 12:25:55 AM by Z71 »
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