Speedo Ratio Box (or Adapter Box)

This section is for talk about anything to do with transmission or drivetrain.
Post Reply
Johnno
Posts: 18
Joined: Fri May 04, 2012 7:53 pm

Speedo Ratio Box (or Adapter Box)

Post by Johnno »

Hi Guys,

Wanting to install a Ratio Box (or adapter box as they are sometimes called) to compensate for a taller diff in the Lancer. The original diff was a 3.89:1 (I think) and the newer diff out of a Scorpion is close to 3.30:1.
At an indicated 80 kph on the speedo, the actual speed is closer to 90 kph.
Anyone know of a supplier of ratio boxes whose prices aren't exorbitant?
And anyone know the thread size on the speedo cable and the size of the square drive?

Thanks.
Post Reply