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L78steve
02-03-2018, 03:52 AM
Why is it that some 70 GTO's came with 10 bolt rears and some 12 bolts?

GotGrunt
02-03-2018, 05:26 AM
In 1970, only the 455 got the 12-bolt.

L78steve
02-03-2018, 02:22 PM
I have a friend that has a 70 GTO Judge RA III that has the 12 bolt. Its dated for the cars build. Pretty sure it came that way.
Is this possible? Any other known exceptions?

GotGrunt
02-03-2018, 02:37 PM
It’s possible, but not probable. Only the 455 HO was supposed to get the 12-bolt from the factory. The axle code should be one of the following:

3.31 ratio - WU: open carrier, XU: posi

3.55 ratio - WV: open carrier, XV: posi

Tracker1
02-03-2018, 04:58 PM
I have a friend that has a 70 GTO Judge RA III that has the 12 bolt. Its dated for the cars build. Pretty sure it came that way.
Is this possible? Any other known exceptions?

It was either a 455 car from the factory or somebody put the 12-bolt in there. OR it is a very, very rare factory mistake, which would be impossible to document.

marxjunk
02-04-2018, 03:12 AM
didnt all Oshawa Judges and GTOs for 70 get 12 bolts regardless of engine, because of the supplier location?

I know all the canadian built skylarks did, even if they had a 6 cylinder..i myself have removed 3 from 350 2bbl cars

Tracker1
02-04-2018, 06:39 PM
Nope

auwrestling
02-04-2018, 08:00 PM
didnt all Oshawa Judges and GTOs for 70 get 12 bolts regardless of engine, because of the supplier location?

I know all the canadian built skylarks did, even if they had a 6 cylinder..i myself have removed 3 from 350 2bbl cars

No I’ve owned several of them and a friend of mine still has an original silver 70 judge all 10 bolt and all oshawa build cars

marxjunk
02-04-2018, 10:20 PM
humph....new lesson for me...

L78steve
02-09-2018, 03:27 PM
What if the 3.55 was specified buy the customer? Then it would have to be the 12 bolt.

flyingn
02-10-2018, 01:14 AM
What if the 3.55 was specified buy the customer? Then it would have to be the 12 bolt.


3.55's came in 10 bolts too

L78steve
02-10-2018, 02:29 PM
Got it thanks. I thought the 10 bolt was a 3.42.

mike1971
02-15-2018, 02:50 AM
My 70 R/A III Judge orifinal survivor has a 12Bolt Steve.

L78steve
02-15-2018, 10:53 PM
That's very interesting Mike. Goes against what the posters are saying. Need to look into this some more.
Thank you for the info.