I looked at buying a 70 GTO 455 . auto car , came factory with a 12 bolt chevy 2.73 peg leg. I was told the ratio was ordered as the owner was a traveling farm eq. salesman.
455 GTO all recieved teh 12 bolts from what I read, as it was considered the Heavy Duty option.
???? that's hearsay !
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later...rog
AADD supporting member !!
I'm a collector...not a builder!!Located in sunny central Saskatchewan at the lakehead!
I looked at buying a 70 GTO 455 . auto car , came factory with a 12 bolt chevy 2.73 peg leg. I was told the ratio was ordered as the owner was a traveling farm eq. salesman.
455 GTO all recieved teh 12 bolts from what I read, as it was considered the Heavy Duty option.
???? that's hearsay !
I'm Carl Stevenson and I approve of this message!!!!!
Isn't that how the politicians endorse something???
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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles
1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
If you look at the 1970 Pontiac LeMans Brochure on this website you will find a sanned copy of my build sheet for my 70 LeMans SW.
This is the build sheet which I just referred to a few hours ago in my post to Carl.
My point being that some build sheets have not always been a true account of what was delivered to the new customer.
The second example which I said that I would share with you, is is:
In 1966 a friend of mine bought a 1966 Chev Caprice 4 door hdtop off the showroom floor. The paperwork plus the decals and badges all said that there was a L35 396 325 hp motor under the hood. He had that car for 5 years and then sold it to his father in law. Some years later his father in law went to have the engine rebuilt...when the guys took the engine apart they found out that it was actually a L36 427 390 hp engine
At that time ( the middle 1960's)there were rumors going around that due to labour problems at the GM plants...sometimes the assembly line workers would do things like this...i.e. switch parts...install things that were not noted on the build sheet.
If this has occurred back then...then the build sheets, etc.. can not be guaranteed as being always 100 % accurate.
I would totally agree with you that build sheets can have mistakes. Humans likely were responsible for data entry on them!
Did the shop check the actual ratio on that 12 bolt in your wagon to confirm what it was? Likely a 3.07 and such a trivial difference that nobody would ever catch it.
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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles
1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
They just told me that it wasn't the normal 10 bolt Pontiac rear end...that it was a heavy duty Chev 12 bolt rear end with posi traction.. From my experience with that car I know that the ratio of 3.08 or 3.07 would be about right because when I was cruising along the highway at 70 mph (the speed limit on the local freeway back then in the early 70's) the factory option tach read 2,000 rpm)
