Differentiel gear ratio change?

[Mamel]

Hello everybody

Some guy told me that the gearbox ratio from a 28-29 model A rear end is different then a 30-31?

Is this true?

Best regards
Philips M.

[Tom Wesenberg]

My 1928 has the stock 3.70 to 1 ratio, and most all of the 1929 -1931 cars would have the stock 3.78 to 1 ratio.

[jhowes]

When I was young people said that the roadsters and phaetons had the 354 rear in them. Is that true? Jack

[Mamel]

Originally Posted by Tom Wesenberg

My 1928 has the stock 3.70 to 1 ratio, and most all of the 1929 -1931 cars would have the stock 3.78 to 1 ratio.

Is there a noticeable difference between the 2? How much slower would the 28 with 3.70 to 1 ratio be?

[john charlton]

The the 3.70 is a very slightly higher gear than the 3.78 so you will go very (and I mean very) slightly quicker with the 3.78 ratio.

John in dark rainy Suffolk County England .

[denniskliesen]

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Guys I think with the same tires, same engine RPM, 3.70:1 will give you slightly faster ground speed than 3.78:1...

[Tiny]

Originally Posted by jhowes

When I was young people said that the roadsters and phaetons had the 354 rear in them. Is that true? Jack

No they all came standard with the 3.78 but I bet a dealer or two may have changed the ratios
I have a rear end with a 4.11 R&P in it. Someday if I get to build my hill climb car that's going in it.

[Benson]

Originally Posted by jhowes

When I was young people said that the roadsters and phaetons had the 354 rear in them. Is that true? Jack

J,

Vince Falter's site says that 3.54's were Post 1934 and available in the AfterMarket for A and B Models.

Not sure what year they came out in Aftermarket.

Read about it here:

http://www.fordgarage.com/pages/rearaxleratios.htm

[hardtimes]

Originally Posted by jhowes

When I was young people said that the roadsters and phaetons had the 354 rear in them. Is that true? Jack

When I was putting my '30 roadster together from parts, I looked at old literature, then went to an old timer and talked to rear gearing for my roadster. He said same thing that printed info said, i.e.- Ford thought that to make the '30 roadster seem to be more peppy / sporty , that a 3:54 rear ration would be used. So located a nos 3:54 set and that was installed.

Right or wrong, this gear set works well in a light roadster...it does seem to go nicely.

[racingrufus]

I have a 29 Special Coupe that pinion nuts came loose. When I took it apart I found it had 4.11 gear set in it. I ordered a 3.54 gear set with new bearings and seals and never looked back, great cruise speed at 50 to 55 mph and I have been 65 mph with out straining the engine.

[BILL WILLIAMSON]

You NEVER know what "someone" put in these OLD cars! Some people even have "UPGRADED" body parts & pieces!---I have 1999 Stents & 2001 Titanium Screws & a rod from 1981!
Bill Heinz

[Dick Steinkamp]

Originally Posted by hardtimes

Ford thought that to make the '30 roadster seem to be more peppy / sporty , that a 3:54 rear ration would be used.

To make a car feel more peppy/sporty, you would install a LOWER gear ratio, not a higher one.

[Marvin/TN]

I don't know this to be true but have always heard that the 29 Model A was the fastest of the 4 years of production.

[BILL WILLIAMSON]

Originally Posted by Marvin/TN

I don't know this to be true but have always heard that the 29 Model A was the fastest of the 4 years of production.

Marvin,
I've also heard that the '32 V-8 was the FASTEST V-8, because of some SNEAKY Cam they used, for 1 year only???--I "think" I heard it was a STEEL cam????
Bill Racer