Posi codes. - Pontiac GTO Forum
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post #1 of 3 (permalink) Old 01-12-2010, 10:32 AM Thread Starter
 
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Posi codes.

Hi.
Can anybody advise if the codes "40 13 GM 965 XO" in the rear diff (66 GTO)
bear any relevance to the axle ratio? If so what ratio would they make it. Or are they just factory part stamps.
I am a new member from the UK. (not many goats over here).
Many Thanks.
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post #2 of 3 (permalink) Old 01-13-2010, 08:59 AM
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Originally Posted by Gran Turismo View Post
Hi.
Can anybody advise if the codes "40 13 GM 965 XO" in the rear diff (66 GTO)
bear any relevance to the axle ratio? If so what ratio would they make it. Or are they just factory part stamps.
I am a new member from the UK. (not many goats over here).
Many Thanks.
If it's a true '66 axle, look on the back of the axle tube, passenger side for a "stamped" 2 letter code. Should begin with a w, x, y or z. The x codes were XE, XF, XG and XH. No XO. Could it be an XG? The code will tell you the ratio and whether or not it was a posi.



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post #3 of 3 (permalink) Old 01-13-2010, 10:14 PM
 
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Hi there, I know how frustrating it can be not being able to find answers to questions....you are curious about.......I found this on line....Hope it is helpful.....

http://www.wallaceracing.com/axledata2.htm
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  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, Lemans & GTO General Discussion

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