jimkari

Does anyone know what is the proper number of teeth on the speedometer gear for a 1975 M20 Borg Warner T-10 4 speed trans with a 3.08 rear gear and 225-70-15 tires? Looking inside the trans it appears I have the green drive gear. It looks like it has five outer threads on the gear. I've done a bunch of searches and keep coming up with different answers. It seems like with the green drive gear I should be running either the 18 or 19 tooth gear.

I really appreciate any advice.

Thanks,

Jim

AzMotorhead

Here ya go
speedo calc

Team Lazy

I have the same setup, bought the natural 19 tooth. Haven't had the time to install it yet, but that's what all my research led me to.

jimkari

Thanks, guys, it seems like the 18 or 19 is the way to go. I'll check out the site AZMotorhead shared.

Jim