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Jeep Parts Home » Jeep Drivetrain Jeep Axles & Differentials » Jeep Speedometer Drive Gears » Speedometer Long Gear, 39 Teeth

Speedometer Long Gear, 39 Teeth

Rugged Ridge | Part Number: RUG18760.28
  • Technical Details

    • Fits 1987 to 1993 YJ Wrangler
    • Fits 1955 to 1986 CJ
    • Fits 1984 to 1993 XJ Cherokee
    • Fits 1986 to 1992 MJ Comanche
    • With cable speedometer
    • Green 39 teeth long gear

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.

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Questions & Answers

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2 Questions | 2 Answers
Displaying questions 1-2
  • Q:

    I have a 91 YJ. I would like to put on 35" tires. gears are factory. how do I know what they are.
    Asked on 11/30/2014 by D

    1 answer

    • Staff Reviewer


      Hi D,
      The Jeep YJ's came with several options on gear ratios, the easiest way to determine what
      you have is to give the VIN number to a Jeep dealership and they will have that information.
      If you don't have the serial number, you'd need to count the ring and pinion teeth. Thank you
      for the inquiry.

      Answered on 12/1/2014 by Jim G from Ohio
  • Q:

    Hi....I have a 91 YJ wrangler with 4.88 gears and 35" tires. I think this is the speedo I need. I am a little confused on "long" vs. "short" Thanks!
    Asked on 11/14/2014 by Jeepforever from Horseheads, NY

    1 answer

    • Staff Reviewer


      Hi Jeepforever,
      Yes, this 39 tooth gear from Rugged Ridge is correct for the '91 YJ w/35" tires and a gear ratio
      of 4.88. The short shaft versions of the gears were only used from '93 to '06.
      Thanks for the inquiry!

      Answered on 11/14/2014 by Jim G from Ohio
Displaying questions 1-2

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