Differentiel gear ratio change?
- Thread starter Mamel
- Start date
Tom Wesenberg
Well-known member
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
Well-known member
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 .
John in dark rainy Suffolk County England .
denniskliesen
Well-known member
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
Well-known member
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.
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
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hardtimes
Well-known member
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.
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racingrufus
Senior Member
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
Well-known member
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
Bill Heinz
Dick Steinkamp
Well-known member
To make a car feel more peppy/sporty, you would install a LOWER gear ratio, not a higher one.
BILL WILLIAMSON
Well-known member
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
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