When changing tire size or axle gear ratio's your original speedometer gear will not register the same MPH as it did with the stock gears and tires. The MPH will either read higher or lower than what the vehicle is actually traveling. You will need to change the speedometer transfer case gear to the correct tooth count to obtain the proper MPH reading on your Speedometer. Use the Tire and Gear Ratio Chart to determine which Tooth Gear you will need to correct your MPH speedometer reading.
When re-gearing to 4.56s this is the perfect gear to correct the speedometer for accuracy.
This is the suggested speedo gear for 4.88's and 33 inch tires. The speed is still off however. At 65 mph gps says I am going about 62-63. A lot closer than it was and I'll contribute it to tire wear.
Changed the diff gears and speedo was off. Replaced gear with corrected number of teeth... (see gear calculator on web-site) Be sure you install correctly. The transfer case has a index tab that lines up with the speedo drive assembly. The Speedo assembly has different numbers at four locations. Select the ones that include your number of gear teeth. Don't forget the oring when buying a new gear..
Rugged Ridge was established in 2005 by the company Omix-ADA to focus on innovative aftermarket Jeep accessories. Many of Rugged Ridge's recent designs are so innovative they have been patented. This includes their floor liners, snorkel and XHD Modular Bumpers. Since 2005 Rugged Ridge has developed and manufactured over 3,000 kinds of Jeep related products. All Rugged Ridge Jeep accessories are trail rated. The Omix-ADA founder came from a family that owned a small Jeep dealership. It was the founder's dream from a young age to own a company that made accessories for Jeeps. The founder manifested the dream in 1992. Shop Rugged Ridge Now