Speed gear formula
Thread Starter
Instructor
Joined: Apr 2003
Posts: 144
Likes: 0
From: Neenah WI
Speed gear formula
I know this was covered in the past but I could not find the thread.
I am changing my tires on my 69 to a 1" smaller diameter tire than stock. Obviously this is going to mess up my speedo.
I have a standard 4 sp (manual) and 3.36 rear gears. I am putting 225/70r15 tires on.
Any one know what gear I need to put in or even a web site I can find out, as well as wear I can get the gear. My tire place doesn't handle them.
I am changing my tires on my 69 to a 1" smaller diameter tire than stock. Obviously this is going to mess up my speedo.
I have a standard 4 sp (manual) and 3.36 rear gears. I am putting 225/70r15 tires on.
Any one know what gear I need to put in or even a web site I can find out, as well as wear I can get the gear. My tire place doesn't handle them.
Race Director
Joined: Mar 2001
Posts: 11,322
Likes: 1
From: Living in the Hartland
Burning Brakes
Joined: Feb 2001
Posts: 929
Likes: 5
From: Marietta GA
Re: Speed gear formula (69Sting)
You may want to try a speedometer repair place. I just got my speedo working after 20 years. They needed my tire size or revs per mile, transmission gear ratio in the highest gear, and differential ratio. They sold me a brown colored gear and I am only off by 1 mile per hour.
