Your Jeep Wrangler
installing larger tires on your Jeep, it is important to change your
speedometer gear as well. If you don't, your speedometer and odometer
will be slightly to dramatically off depending on how much bigger
you went. Fortunately, speedometer gears are relatively cheap, readily
available at your dealer and take all but 5 minutes to swap out.
You Will Need
Appropriate Speedometer Gear (See Chart on Right)
• 1/2" Socket or Wrench
Determine what speedometer gear you need by using the chart
on the left. Select what gear ration you have and look across to the
tire size you just installed and where the two meet, that's the tooth
gear you will need. The
part number you will need to ask for will be 520676
+ the tooth number. For example, if you need a 34
tooth gear, the part number would be 52067634.
under your Jeep and locate the speedometer gear housing. It will be
attached to the rear of your transfer case on the driverside.
3. Using a 1/2" socket or wrench, remove the
retaining bolt and clip.
4. Firmly grab the speedometer
gear housing and pull the entire thing out of the transfer case. You
may need to rock it back and forth a bit to do this. Be sure to have
a rag handy as ATF will drip.
5. Inspect the rubber
O-ring on the housing for cracks or damage.
6. Hold the speedometer
gear housing in one hand and the gear itself in the other and then
carefully pull them apart.
7. Take your new speedometer
gear, lube the shaft just a bit with the ATF in your transfer case,
and then plug it into the housing.
8. Make sure the rubber
O-ring is seated properly and then re-insert the assembled speedometer
gear and housing back into the transfer case.
9. You will notice that
there are a series of number located along the side of the speedometer
gear housing. Select the appropriate tooth gear range you just installed
and rotate it until it is aligned with the raised dot on the transfer
case as shown in the pic to the left.
10. Re-install the retaining
clip and bolt.
That should be it. Nice, fast and easy mod. Please let me know if
you have any questions.