What was the standard axle ratio for model T coupe in 22
Standard Ford ratio for cars was 3.63 to 1 ref page 75 of "The Model T Ford Owner" by Murray Fahnestock. That is an 11 tooth drive shaft pinion with a 40 tooth ring gear.
If an owner lived in hilly or mountainous areas they might have opted to have a 4:1 ratio to better climb up and stop while going down the grades. That is a 10 tooth drive shaft pinion with the 40 tooth ring gear.
Ralph Rick (R.I.P.) posted some details on that 10 verses 11 tooth drive shaft pinion at: http://www.mtfca.com/discus/messages/257047/303232.html?1343701760
The Tulsa Chapter web site has an excellent article on gear ratios verses speed, stopping, and hill climbing capability. Their conclusion for most fairly stock Ts the standard 3.63 to 1 ratio was a good choice. See: http://mtfctulsa.com/Tech/power_and_torque.htm and scroll about half-way down to "What about high speed gears."
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Thanks for sharing made a lot of sense to me. I will be looking for a set of 4: 1 gears , lots of hills and no interstate here , Western new York.
If your ring gear is good, you only need a 10 tooth pinion gear. The 40 tooth standard ring gear can be used with the 11 tooth pinion or the 10 tooth pinion.
Has anyone got a 10 tooth pinion or sale, I will take the rear end apart once I get it home and look at the thrust washers before any long drives,may also want a high compression head , Ron
Ron, take the entire rear axle apart including the drive shaft. The thrust washers are not the only parts that will need to be replaced.