Determine what speedometer gear you will need by using this chart. 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.
Your speedometer gear is located on the back of your transfer case as shown in the pic above.
As you can see, the number of teeth is indicated on the gear itself. This 34 tooth gear was installed by the factory to accommodate 30" tires and 3.73 R&P.
Using a 1/2" socket or wrench, remove the bolt securing your speedometer gear.
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.
Pull the speedometer gear out of the housing.
Select the appropriate gear index on the housing and align it to the dot on the transfer case as shown above.
Changing Your Jeep Wrangler
Speedometer Gear


After 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.

What You Will Need
• Appropriate Speedometer Gear (See Chart on Right)
• 1/2" Socket or Wrench
• Ratchet
• Rag

Installation
1. 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.

2. Climb 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.

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