Interesting. In 55-56 the OD cars had 4.11 gears, standard stick shift had the 3.70's (PG had 3.55). Maybe higher highway speeds led to the slightly taller gears in later models?
Dave
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1956 Pontiac Pathfinder 2dr sedan, 496 - dyno'd 545 hp, stick shift, 4.11 posi - Hot Rod
In 55-56 the Chevies had 15" wheels and 85-series tires (tall & skinny). For 57 the wheels were changed to 14".
Overdrive in the 1960s was not offered on Canadian made Chevy or Pontiac cars.
Air conditioning generally took the rear ratio up to the next higher numerical ratio, although in 1967 - 68 a big block car with air only could be had with a 3.07 ratio regardless of horsepower or trans. Also air conditioning was not factory installed on Canadian Chevelles or Beaumonts until the 1968 models.
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67 Chevelle Malibu Sport Coupe, Oshawa-built 250 PG never disturbed.
In garage, 296 cid inline six & TH350...
Cam, Toronto.
I don't judge a man by how far he's fallen, but by how far back he bounces - Patton
In 55-56 the Chevies had 15" wheels and 85-series tires (tall & skinny). For 57 the wheels were changed to 14".
Overdrive in the 1960s was not offered on Canadian made Chevy or Pontiac cars.
Air conditioning generally took the rear ratio up to the next higher numerical ratio, although in 1967 - 68 a big block car with air only could be had with a 3.07 ratio regardless of horsepower or trans. Also air conditioning was not factory installed on Canadian Chevelles or Beaumonts until the 1968 models.
The 67-68 B-bodies with AC and a M20 had 3:31 gearing.
The 67-68 B-bodies with AC and a M40 had 3:07 gearing.
The M40 AC cars had gearing options of 2:73 which was considered a economy option, or you could get 3:31 gearing as a performance option.
The AC M20 cars had a 3:55 gearing option which was called the performance ratio. There was no optional Economy gear ratio listed for M20 cars.
-- Edited by 2qwik2c on Thursday 25th of November 2010 10:16:11 AM
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1967 2dr Biscayne. L36, M40, G80, K05, F41. #'s. 1967 Impala convert. 283, glide. Parked in the garage since 74 and hasn't moved. Soon to be BB 4speed.
In 55-56 the Chevies had 15" wheels and 85-series tires (tall & skinny). For 57 the wheels were changed to 14".
Overdrive in the 1960s was not offered on Canadian made Chevy or Pontiac cars.
Air conditioning generally took the rear ratio up to the next higher numerical ratio, although in 1967 - 68 a big block car with air only could be had with a 3.07 ratio regardless of horsepower or trans. Also air conditioning was not factory installed on Canadian Chevelles or Beaumonts until the 1968 models.
The Beaumont parts book has some a/c parts listed for 67 and the assembly manual has it documented on microfiche for 67 models. Do we know for sure it never happened? They certainly did plan it because the drawings are there. I sure have never heard of one with factory air though.
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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)
Howdy I can verify that my 66 big block B body AC car came with 3:31's too.
Is it a 4 speed car??
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1967 2dr Biscayne. L36, M40, G80, K05, F41. #'s. 1967 Impala convert. 283, glide. Parked in the garage since 74 and hasn't moved. Soon to be BB 4speed.
No 396 with Powerglide. (the car in the Avatar picture)
-- Edited by 66 Grande guy on Thursday 25th of November 2010 12:49:32 PM
Very nice, 3:31 standard gear with AC and powergilde. Optional gear was 3:55 "performance". No economy gearing option.
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1967 2dr Biscayne. L36, M40, G80, K05, F41. #'s. 1967 Impala convert. 283, glide. Parked in the garage since 74 and hasn't moved. Soon to be BB 4speed.
Air conditioning generally took the rear ratio up to the next higher numerical ratio, although in 1967 - 68 a big block car with air only could be had with a 3.07 ratio regardless of horsepower or trans.
Huh. 'Splains why my 67 Corvette with factory air and 427 came with that 3.07 - not much for off-the-line acceloration, but mean on the highway, eh?
Dave
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1956 Pontiac Pathfinder 2dr sedan, 496 - dyno'd 545 hp, stick shift, 4.11 posi - Hot Rod
1956 Pontiac Pathfinder 2dr sedan, 496 - dyno'd 545 hp, stick shift, 4.11 posi - Hot Rod