Help decoding this 12 bolt please - Impala Tech
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post #1 of 4 (permalink) Old 02-09-2010, 06:45 PM Thread Starter
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Help decoding this 12 bolt please

Guys,
The 12 bolt rear is still in the frame of the 69 Impala parts car that I recently scrapped. The code appears to be (mis stamped) GK ( I think it was intended to be CK) 0521B. Please correct me if I am wrong, but I interpret it as 3.07 Posi, 21 May, Buffalo.

Thanks,
Scott
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post #2 of 4 (permalink) Old 02-09-2010, 07:21 PM Thread Starter
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Doh! 69Tom informed me that it is a 2.73 Heavy Duty. I was getting my info from the chevelle section What exactly was the difference between a regular 12 bolt open and a HD unit?
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post #3 of 4 (permalink) Old 02-09-2010, 07:55 PM
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HD had the extra control arm (two upper control arms instead of only one) welded to the axel tube on the passenger side. this is an open rear aend withh all of the info you posted as correct.

Big Dave
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post #4 of 4 (permalink) Old 02-09-2010, 10:35 PM
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For a 1969 Impala Gk would be correct. It's a non posi 2:73 12 bolt.

http://www.impalas.net/forums/image.php?type=sigpic&userid=521&dateline=14693626  69
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