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10-26-2022, 02:25 PM | #1 |
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1930 common rear axle ratio
like to know the most common rear axle ratio.
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10-26-2022, 02:33 PM | #2 |
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Re: 1930 common rear axle ratio
3.78 is the most common. Others - 4.11 and 3.54 were available from dealers usually. Sometimes you could get parted out rear ends with these.
Vic |
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10-26-2022, 02:47 PM | #3 |
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Re: 1930 common rear axle ratio
Thanks
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10-26-2022, 07:43 PM | #4 |
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Re: 1930 common rear axle ratio
I believe 3.78 is the most common. However, with today's road conditions, cost of gas, etc I would have no problem with 3.54 in it. If your engine is really strong or you live in flatlands, I would recommend the 3.25/27. I put 3.54s in my two coupes and i can't imagine what Henry was thinking of when he used the 3.78s. But it can be expensive (About $700 ) and a lot of work. Good Luck!
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10-26-2022, 08:07 PM | #5 | |
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Re: 1930 common rear axle ratio
Quote:
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10-26-2022, 08:30 PM | #6 |
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Re: 1930 common rear axle ratio
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10-27-2022, 08:22 AM | #7 |
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Re: 1930 common rear axle ratio
3.78 with an overdrive and high compression head (6.0:1) = 20 mpg.
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10-27-2022, 08:41 AM | #8 |
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Re: 1930 common rear axle ratio
This is a list of all I could find:
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Bob Bidonde |
10-27-2022, 10:01 AM | #9 | |
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Re: 1930 common rear axle ratio
Quote:
Not sure if you are suggesting the 3.54 ratio was available from the Ford Agency (dealership) or a reproduction parts dealer, but I have heard this stated many times that Ford offered the 3.54 back in the day. I am curious if you, -or anyone has any proof of this. The reason I ask is I have researched it at the archives and know there was a pre-production experimental gear set that was a 3.54 however it was superseded in production by the 3.70. Outside of that, I have never seen any print or literature that has shown the 3.54 ratio for a Model-A. Does anyone have anything to confirm it was indeed available back then?? Bob, to muddy up the waters and add another ratio or two to the mix, in early 1932 all V8 powered vehicles came standard with a 4.33 gear ratio (-which interchanges with the Model-A R&P). Then, there is a 4.56 gear ratio that was offered in the AF models along with a 4.88 gear set that was manufactured by Power King to use in their Economy Tractors that used cut down Model-A rear axle assemblies. |
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10-27-2022, 11:16 AM | #10 |
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Re: 1930 common rear axle ratio
In my Ford (Canada) parts catalog, dated 1938, only the 3:78 and 4:111 matched sets are listed as available for 1928-32 A, B and 18. The only 3:54 - high speed- set is listed for 1935-36 Model 48, 50. 67 and 68.
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10-27-2022, 11:48 AM | #11 |
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Re: 1930 common rear axle ratio
During Model A production three ring & pinion ratios were used. The early 28's used a 370 ratio. The majority of cars used a 378 ratio. Pick-up trucks, station wagons, and some town sedans used a 411 ratio. The 354 ratio was introduced as an after market some years later when the country's roads improved.
Here is a list of the ratios available today: 370 - 37\10 411 - 37\9 378 - 34\9 354 - 39\11 327 - 36\11 433 - 39\9 (1932) Divide the smaller number into the larger for the ratio. The numbers are the tooth count on the gears. The attached article describes the the early ring & pinion. http://www.santaanitaas.org/wp-conte...ing-Pinion.pdf Tom Endy |
10-27-2022, 11:54 AM | #12 |
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Re: 1930 common rear axle ratio
Just in case you are considering swapping to a 3:54 gear you should know that a Model A motor (Even modified) won’t pull a 3:54 and an overdrive and you lose “parade gear” first
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10-27-2022, 08:17 PM | #13 | |
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Re: 1930 common rear axle ratio
Quote:
Terry |
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