1930 A rear end ratio

bluzrocker

bluzrocker

Member
was there more than one rear end ratio for a model A car? and if so what ratios were std or any other one available?:D what ratios came standard in 30 Briggs?
 
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Without research I think it was 4.11, 3.78 and 3.54. If I remember correctly the 3.54 was in some of the '28-'29 roadsters but don't but too much stock in my memory. Today you can get 3.27 aftermarket. Depending upon how many hills you have to deal with and how much load you intend to carry I think you would like the 3.54 the best with 3.78 being second choice. Drive a couple of cars and decide for yourself as I am basing my opinion on my experience with a lighter vehicle ('31 RDPU). What do you have now and do you need to change it?

Charlie Stephens
 
I think the Briggs was 3.78 as factory.

Today's generally improved engines (cams, high compression heads, improved intake manifolds and/or carburetors) have allowed many to take advantage of 3.54 and in some cases the 3.27.

I run the 3.54 in my pickup (originally 4.11 but that was to carry a load) and with a standard engine/rebuild (no cam, no HC head, OEM manifolds & Carb) I have no problems. But the truck a bit lighter than a Briggs.

Joe K
 
In the central valley with a new engine with some upgrades you should be able to get away with 3.54's. You just lose in the hills and take off from the light.

Mike
 
The early model A's had a 3.70 to 1 ratio. The standard ratio for the later model A's was 3.78 to 1 . Some pickups had 4.11 to 1ratio Some think that the 4.11 was a special order ratio. I prefer the 3.78 ratio
 
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