GTO Rear End Identification help???? - Pontiac GTO Forum
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post #1 of 15 (permalink) Old 03-13-2014, 06:31 PM Thread Starter
 
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GTO Rear End Identification help????

Hi All:

Need help figuring out what I have for a rear end. CN4 is on the lower pumpkin and its a 10 bolt. this is on a 1968 GTO.

Thanks for any help.

Tom
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post #2 of 15 (permalink) Old 03-14-2014, 02:11 PM
 
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Well if it looks like this, then it's a BOP rear end. To identify, look on the axle tube to the right of the pumpkin, should be about 6" to 12" away 2 letters about 1/2" tall and will be something like ZH. Here's a link to the codes.
http://www.wallaceracing.com/axledata2.htm
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post #3 of 15 (permalink) Old 03-14-2014, 10:05 PM Thread Starter
 
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1968 gto rear end help identification

Quote:
Originally Posted by 68GTO4004Spd View Post
Well if it looks like this, then it's a BOP rear end. To identify, look on the axle tube to the right of the pumpkin, should be about 6" to 12" away 2 letters about 1/2" tall and will be something like ZH. Here's a link to the codes.
http://www.wallaceracing.com/axledata2.htm
What is a BOP?
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post #4 of 15 (permalink) Old 03-14-2014, 10:17 PM
 
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Originally Posted by FireFox3434 View Post
What is a BOP?
Buick olds pontiac
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post #5 of 15 (permalink) Old 03-15-2014, 12:26 AM Thread Starter
 
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Hi here are some pics of rear

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post #6 of 15 (permalink) Old 03-15-2014, 11:55 AM
 
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Pontiac did not add the rear anti-roll bar until the 1970 model. You have a 1968, so either yours has been added on to the original rear, or the rear end has been swapped to include the sway bar set-up.

68GTO4004sp provided the link you need to identify a Pontiac rear. Find the axle code on the axle tube as noted in the article. The numbers you provided may simply be part numbers or even foundry numbers. Get a copy of your car's build sheet from PHS services which will help identify the original rear end as well as all other codes, parts & options.
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post #7 of 15 (permalink) Old 03-15-2014, 02:29 PM Thread Starter
 
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I have the PHS documentation.

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post #8 of 15 (permalink) Old 03-15-2014, 02:31 PM Thread Starter
 
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Found GAC 035 2 on one tube in front . If your looking from back of car its on the right in front tube.

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post #9 of 15 (permalink) Old 03-17-2014, 06:21 PM
 
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Originally Posted by FireFox3434 View Post
Found GAC 035 2 on one tube in front . If your looking from back of car its on the right in front tube.

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Using the forementioned Wallace Rear End Codes provided earlier, it looks like G=Detroit Gear&Axle, AC=1970 Grand Prix, non-posi, 2.78 axle ration. Assume the 03=March and 5 may be 5th day, 2=night shift. Grand Prix's probably had the rear sway bar in 1970.

How does that match with your PHS documents as being the original?
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post #10 of 15 (permalink) Old 03-18-2014, 07:08 AM Thread Starter
 
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Quote:
Originally Posted by PontiacJim View Post
Using the forementioned Wallace Rear End Codes provided earlier, it looks like G=Detroit Gear&Axle, AC=1970 Grand Prix, non-posi, 2.78 axle ration. Assume the 03=March and 5 may be 5th day, 2=night shift. Grand Prix's probably had the rear sway bar in 1970.

How does that match with your PHS documents as being the original?
Thanks Jim now I get how to decode. It didn't match that's why I needed to know what it was.
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