| This is the speedometer pinion or cog gear that goes in the transmission. These gears are accessible from the outside of the gearbox, but it does take a special tool to change the gear itself once you've removed the gear/housing assembly. All speedo gears for these cars are color coded. This particular gear is blue and has 18 teeth. It is for use with the 3.70 gear ratio that came stock in some zx's from 79-83. Note: if you change your tire height from stock then you should also change your speedo pinion gear to compensate. Changing tire height is just like changing the gear ratio in your differential, it does affect the accuracy of your speedometer. If we happen to be out of stock please allow an extra week for delivery. If you'd like, we can ship this unit anywhere in the USA, in a padded envelope via the post office for 6.50. If you'd like that feature just put a note in the comment section of the order form. Last update 01/12 | 
