Transmission to Speedometer Drive Gear

[Tom Wells]

520,

This page may help you: TCI Speedometer Gears and Accessories | JEGS

The driven gear is most likely the one you need to replace, and there's a selection shown near the top along with ways to estimate which one may work for you.

It's on the speedometer cable end outside the trans and is easy to replace. Some fluid may try to escape so take some care...

Count the teeth on the existing gear, then select a new one that is closest to the number of teeth you decide you need.

Near the bottom there's a clip you may need.

Tom

[cobra 53]

Easy speed correction calculater.

Drivetrain / Speed correction

https://lmr.com

[patrickt]

Originally Posted by Tom Wells

520,

It's on the speedometer cable end outside the trans and is easy to replace.

On ERA cars, it's a medium PITA to get the hold down bolt back in. Here's a pic of mine after I had applied some Torque Seal to it.



if you're going to pull your speedo cable off, you might has well lubricate it if you've seen even a hint of needle bounce. A detailed thread on that can be found here: Lubricating the Smiths Speedometer Cable To Stop Needle Bounce