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..
Took about five minutes to install. Make sure you put retaining clip in the right slot on your Speedo Sensor. It's marked for different size gears.
After a tire and/or gear change this is the only way to correct your speedometer. This can be changed in less than 10 minutes. Make sure you clock it right.
Nice that it is color coded. Fit well. Corrected speedo as designed. Easy to install.
Simple swap out....TJ now marking true MPH.
This Long Speedometer gear looks like the old 16T gear. Although the old gear has straight teeth, this has Helical style . Question : 1) will this gear match up to the drive gear or do both gears need to be changed ? Spicier / Dana 20 transfer case
Asked by Dean from New Hampshire on
Hi Dean The Speedometer Long Gear, 42 Teeth will not work, I checked back in my old books and the gear you need is no longer available. The best thing would be to find a doaner transfercase for some of the parts as a lot of the parts have been discontinued. Thanks
Answered by LWiff ext 4804 from New Hampshire on
How would you know if you need a long or short speedometer gear. I have a 98 TJ with 3.73 gears. Thanks, Dwayne
Asked by Tidrow55 from Roanoke VA on
Dwayne, the Rugged Ridge Speedometer Short Gear, 30 Teeth is the one you'll need. All Jeeps after 93 use the short gear. Hope this helps!
Answered by Zach O. ext 4939 from Roanoke VA on
Will this work on a 06 rubicon unlimited with a 3.5" rubicon express short arm lift with 285/75-16 Goodyears
Asked by David from on
Hey David, the Rugged Ridge Speedometer Short Gear, 31 Teeth will work with those tires if you have 3.73 ring and pinion gears. Thanks for your question.
Answered by Devin B. ext 4835 from on
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