Dismiss Notice



Register Today It's free! This box will disappear once registered!

Speedometer gear trouble or rear end?

Discussion in 'Stock 1995 - 2001 Explorers' started by rustyzpr, June 30, 2011.

  • Searches ExplorerForum.com
    1. rustyzpr

      rustyzpr New Member

      Joined:
      June 30, 2011
      Messages:
      2
      Likes Received:
      0
      Trophy Points:
      1
      City, State:
      Aurora,Co
      Year, Model & Trim Level:
      '99 Eddie Bauer Edition
      I just bought a '97 Explorer, Eddie Bauer Edition, Control-Trac, V6, 4wd. I noticed that a radar sign posted me at 36 mph while my speedometer read 40. I first thought that the previous owner had changed 15" wheels and tires with the 16"ers that are on it now but the door tag calls for 255/75/16. I do know that the left rear door has been replaced & repainted due to some type of accident. I'm wondering if the rearend was replaced with one from a 15" drive train would this cause the problem? Also will this cause a problem like using 2 different sizes of tires? Should I be worried or not?
       
    2. Support EF

      Join the Elite Explorers for $20

      Explorer Forum has probably saved you that much already, and will continue to save you money as you learn how to diagnose fix problems yourself and learn which modifications work without having to experiment on your own. Elite Explorer members see practically no ads, can add their own profile photo, upload photo attachments in all forums, and Media Gallery, create more private Conversations, and more. Join Today. Your support is greatly appreciated.


      to hide adverts.
    3. swetrid

      swetrid Well-Known Member

      Joined:
      September 30, 2010
      Messages:
      1,896
      Likes Received:
      2
      Trophy Points:
      0
      City, State:
      Reading Pa
      Year, Model & Trim Level:
      1999 Eddie Bauer
      Normal variation, Ford allows 10% percent error. As tires wear the circumference decreases and therefore will affect speedometer accuracy. None are perfect except for certified police calibrations.
       
    4. BrooklynBay

      BrooklynBay Moderator & long time member. Staff Member Moderator Elite Explorer

      Joined:
      November 11, 2005
      Messages:
      52,505
      Likes Received:
      250
      Trophy Points:
      113
      City, State:
      Brooklyn, NY
      Year, Model & Trim Level:
      88 89 93 95 96 Aerostars
    5. gavin

      gavin Elite Explorer

      Joined:
      September 27, 2002
      Messages:
      3,181
      Media:
      11
      Albums:
      1
      Likes Received:
      7
      Trophy Points:
      48
      City, State:
      Anchorage, Alaska
      Year, Model & Trim Level:
      '97 Explorer XLT AWD 5.0L
      less than 10% margin of error, but if you want to be sure, check the axle tag on your rear axle.
      Then check the axle code on the door jamb sticker (assuming it's the original front driver's side door).

      it's certainly possible the rear axle got replaced with one with a different gear ratio
       
    6. RomeovilleIL

      RomeovilleIL Well-Known Member

      Joined:
      October 13, 2010
      Messages:
      1,065
      Likes Received:
      2
      Trophy Points:
      48
      City, State:
      Illinois
      Year, Model & Trim Level:
      98 LTD, 00 XLT
      As said, 10% below is in spec. Check your tire pressure as well. Low air in the rear tires can throw you off quite a bit. We have issues around here with cab drivers who like to air down their tires to increase their fares in the city. News crews like to investigate every so often - at $2 per 1/4 mile it is big $$$.
       
    7. pjtoledo

      pjtoledo Member

      Joined:
      May 24, 2011
      Messages:
      81
      Likes Received:
      1
      Trophy Points:
      8
      City, State:
      Toledo, Ohio
      Year, Model & Trim Level:
      2000 Ranger
      and while you're under there, check the front axle too.



      I would borrow a GPS and see what it reads, way more accurate.
       

    Share This Page







    We Support Our Troops!