Change gear ratio to improve mpg?

[Seth Swoboda]

Yes. I have changed from a 3.78 to a 3.54 a couple of times and now I'm getting ready to change from a 3.78 to a 3.25 in a '37 Ford. You'll need to run the 15/29 gears (15 tooth main drive and 29 tooth cluster) in the transmission to make that swap more drivable out of 1st gear.

**Note** you will need to use a 39 transmission case and the 3in shift fork on your transmission cover to accept the 29 tooth cluster gear.