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Speedometer Gear??

Discussion in 'Wrangler TJ (1996-2006)' started by kyletraci, Dec 7, 2017.

  1. Dec 7, 2017 at 7:58 AM
    #1
    kyletraci

    kyletraci [OP] New Member

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    Kyle
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    On my 2001 Jeep Wrangler, the speedometer is off. I looked up the tire size and matched it up with the stock rear gears and came up with a 30 tire and 307 rear gear. I ordered a 27 tooth speedo gear and according to my GPS I am doing roughly 8 miles an hour faster than the speedometer indicates. Do I go with a larger or smaller gear for the speedometer. Thanks!
     
  2. Dec 7, 2017 at 10:22 AM
    #2
    OFFGRID

    OFFGRID Well-Known Member

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    Houston
    Vehicle:
    1979 Jeep CJ7, 258, TH350, NP208
    Howell fuel injection, header, HEI distributor, TH350, NP208, SOA lift with YJ springs in the front & GW springs in the Rear. AMC20 with G2 1 piece chromos trussed, Dana 30 with G2 chromos and 760x ujoints and MM Stainless Hubs, Geared 4.56. Tom Woods shafts, Metal cloaks, Caged, 37" Toyo MTs.
    I order a programmer to correct it electronically in the computer. As for you question, I believe if you are reading too fast you need to slow it down so more teeth/larger equals fewer rotations and slower speed. Anybody else confirm this?
     
    JKBob 25 likes this.
  3. Dec 8, 2017 at 7:00 PM
    #3
    JKBob 25

    JKBob 25 Well-Known Member

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    Jersey Shore, NJ
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    2" Superlift kit. 315/ 70/17.
    If your Speedo gear doesn't fix the issue. I'd pick up a programmer as @OFFGRID suggested. A Superchip is fairly cheap and would do the trick.
     
  4. Dec 9, 2017 at 7:44 PM
    #4
    kyletraci

    kyletraci [OP] New Member

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    2001 Wrangler Sport
    I will look at a getting a programmer. I work on a military base and they are crazy about speeders. Thanks for the help!
     
    JKBob 25 likes this.
  5. Dec 9, 2017 at 9:03 PM
    #5
    LYFZGOOD

    LYFZGOOD members

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    1998 Jeep Wrangler Sahara
    2.5” lift 32x11.50x15,cold air intake, Smittybuilt stainless steel Bumpers, rough county pocket flares,Rugged ridge seat covers and floor mats. Conversion LED headlights 20’ LED Light bar hardtop,soft top,bikini top.
    Well this is what I did I called Quadratec and told my rear end gears and they in return told me what speedo gear I needed and with my GPS I’m right on. FYI there # is 800-745-5337 hope this helps.
     
    JKBob 25, aggrex and chris4x4 like this.
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