The Ford Barn

sturgis39 · 07-07-2013, 09:41 PM

How and where is the rear end marked for the gear ratio? Do need to interpolate the code? A friend said that most Model "A" reaends are 3:78 ratio.

Thank

Richard in Anaheim CA · 07-07-2013, 10:56 PM

Rear end ratio's aren't marked on the car anywhere. Never were. The speedometer sometimes has numbers that help but in 80+ years who knows what has been changed on a Model A?

You're friend has a very good chance of being correct. since 3:78 is the prevalent ratio.

Richard
Anaheim CA

Rowdy · 07-08-2013, 01:17 AM

If the gear hsg match the rearend gears you may be able to tell. Many things likely have been changed over the years, so that is not an accurate source for that info. Rod

Patrick L. · 07-08-2013, 05:47 AM

As said, 3.78 is pretty much standard. It could also be 4.11 or 3.54. The 3.27 is kinda new. Easiest way to tell is mark wheel and crank pulley, then give a push[ 3rd] and start counting.

Tom Wesenberg · 07-08-2013, 09:18 AM

Also real close to the 3.78 is my 1928 with 3.70, which has 10 and 37 teeth, while the 3.78 has 9 and 34 teeth.

sturgis39 · 07-09-2013, 12:09 AM

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Thanks for the information I plan to count the revolutions.

07-07-2013, 09:41 PM	#1
sturgis39 Member Join Date: Dec 2012 Posts: 87	Rear End Ratio? How and where is the rear end marked for the gear ratio? Do need to interpolate the code? A friend said that most Model "A" reaends are 3:78 ratio. Thank

07-07-2013, 10:56 PM	#2
Richard in Anaheim CA Senior Member Join Date: May 2010 Location: Anaheim California Posts: 562	Re: Rear End Ratio? Rear end ratio's aren't marked on the car anywhere. Never were. The speedometer sometimes has numbers that help but in 80+ years who knows what has been changed on a Model A? You're friend has a very good chance of being correct. since 3:78 is the prevalent ratio. Richard Anaheim CA

07-08-2013, 01:17 AM	#3
Rowdy BANNED Join Date: May 2010 Location: Gothenburg Nebraska Just off I-80 Posts: 4,893	Re: Rear End Ratio? If the gear hsg match the rearend gears you may be able to tell. Many things likely have been changed over the years, so that is not an accurate source for that info. Rod __________________ Do the RIGHT thing - Support the H.A.M.B. Alliance!!!!

07-08-2013, 05:47 AM	#4
Patrick L. Senior Member Join Date: May 2010 Location: Largo Florida Posts: 7,225	Re: Rear End Ratio? As said, 3.78 is pretty much standard. It could also be 4.11 or 3.54. The 3.27 is kinda new. Easiest way to tell is mark wheel and crank pulley, then give a push[ 3rd] and start counting.

07-08-2013, 09:18 AM	#5
Tom Wesenberg Senior Member Join Date: May 2010 Location: Mpls, MN Posts: 27,582	Re: Rear End Ratio? Also real close to the 3.78 is my 1928 with 3.70, which has 10 and 37 teeth, while the 3.78 has 9 and 34 teeth.

07-09-2013, 12:09 AM	#6
sturgis39 Member Join Date: Dec 2012 Posts: 87	Re: Rear End Ratio? Sponsored Links (Register now to hide all advertisements) Thanks for the information I plan to count the revolutions.