Rear End Ratio?

[sturgis39]

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]

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]

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.]

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]

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]

Thanks for the information I plan to count the revolutions.