12 bolt rear - Pontiac GTO Forum
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post #1 of 3 (permalink) Old 10-08-2018, 05:38 PM Thread Starter
 
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12 bolt rear

is a 65-66 chevelle 12 bolt rear a direct bolt in on a 1965 GTO? any alterations to driveshaft? spring locations? or anything else. I know they both used the narrow rear. I have the stock GTO 10 bolt rear in my car with 3:55 gears. the engine I will be using is just shy of 500 HP. thanks for any info. pinion head.
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post #2 of 3 (permalink) Old 10-10-2018, 05:02 PM
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PinionHead is the guru on this one, but in my knowledge, the '65-'66 Chevelle 12 bolt is no stronger than the original 8.2 Pontiac 10 bolt. In fact, it may be weaker. The later 8.5 10 bolt is a stronger unit. For 500HP, I would be looking at a Ford 9 inch for sure.
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post #3 of 3 (permalink) Old 10-11-2018, 11:43 AM
 
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Having had a 9" Ford in a Studebaker, I can verify they are super strong and easy to change ring and pinon gears having a removable center section. Just find one the right width (or have one narrowed) and have brackets for your suspension arms welded on.

Many of the guys on the PY forum - Pontiac - Street - PY Online Forums - use the Moser 12 bolt rears and Moser 9" Ford rears. These are ready to bolt in and will handle far more than 500 hp. Here are some links:

12 BOLT MUSCLE PAK - Moser Engineering

9" HD STAMPED MUSCLEPAK - Moser Engineering

Hope this is of some help.
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  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, Lemans & GTO Undercarriage, Frame, Transmission and Differential Discussions.

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