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  #1  
Old 04-16-2020, 02:13 PM
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napster napster is offline
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Default 1970 GTO 12-Bolt?
It is my understanding is the 1970 GTO only received the 12-bolt rear with the 455. None of the 400 variants got the 12-bolt, they got a 10 bolt. Is this correct?

I have someone telling me the RAIV in the GTO got a 12-bolt. I know that's wrong.

thanks.

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  #2  
Old 04-16-2020, 03:16 PM
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muscle_collector muscle_collector is offline
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came standard with 3:90 optional 4:33. however I did run across a guy who bought his daughter a brand new 69 judge ra4 4 speed and he said and had the paperwork he special ordered it with 3:73 gears and it did have a 12 bolt. so I have always said never say never. back then lots of things were possible if you or the dealer knew the right person.

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Old 04-16-2020, 06:30 PM
marxjunk marxjunk is offline
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depends on where the car was built, i believe all canadian abodys got the 12 bolt, and i also thought i read that 12 bolts where an HD option, someone here on this board has a 70 GTO with a 12 bolt in it..he bought the car thinking it was a 455 car, and it wasnt, just a 400..

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Old 04-16-2020, 06:43 PM
'ol Pinion head 'ol Pinion head is offline
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Quote:
Originally Posted by napster View Post
It is my understanding is the 1970 GTO only received the 12-bolt rear with the 455. None of the 400 variants got the 12-bolt, they got a 10 bolt. Is this correct?

I have someone telling me the RAIV in the GTO got a 12-bolt. I know that's wrong.

thanks.
Only Pontiac usage I've ever run across in 1970 model Pontiac A-body's & GP's were the '70 coded McKinnon built 12 bolts in factory 455 cars & '70 GP's with 400 4spd. Not sure on '70 GPs with 400 & M13 3spd, only have foggy memories of two of those.

For the last 7 or 8 years theres been a misrepresented waaay overpriced McKinnon 12 bolt core on eBay. Listed as special '70 'RA4 usage" the housing of that particular rear is a '69 Mckinion 12 bolt, out of a '69 Canadian built Skylark or Cutlass.

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Old 05-01-2020, 04:51 PM
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Quote:
Originally Posted by marxjunk View Post
depends on where the car was built, i believe all canadian abodys got the 12 bolt, and i also thought i read that 12 bolts where an HD option, someone here on this board has a 70 GTO with a 12 bolt in it..he bought the car thinking it was a 455 car, and it wasnt, just a 400..
I have a Canadian built 242 400 car,,,10 bolt....My buddies Judge (canadian ) has a 10 bolt

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Old 05-01-2020, 05:43 PM
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To a lot of people, all GM posi's are 12 bolt due to the Chevy vernacular. I've heard that term thrown around loosely for 40 years.

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  #7  
Old 05-02-2020, 07:48 AM
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mrennie mrennie is offline
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I have a Canadian built 242 400 car,,,10 bolt....My buddies Judge (canadian ) has a 10 bolt

Me too. My 1970 Oshawa built 400 Judge came with a 10 bolt. My understanding was that only 455 cars got the 12 bolt, as others have mentioned.

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