Speedo gear question ? Please Help.

Discussion in 'The Garage' started by IMPORTKILLER, Jun 13, 2007.

  1. IMPORTKILLER

    IMPORTKILLER New Member

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    I have just installed my t-3650 trans and went away with the POS t-45. My speedometer is way way way off. I ordered the 23 tooth speedo gear from Texas Mustang parts and they told me that this will help but it will still be off some. Does anyone know how much it might be off ?? My rearend gear is a 4.10.
     
  2. scarface

    scarface Guest

    about 10mph I believe....Speedcal is the real fix for you.
     
  3. IMPORTKILLER

    IMPORTKILLER New Member

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    Speedcal ???? :dunno:
     
  4. scarface

    scarface Guest

    http://www.dallasmustang.com/page/speedcal.php now you are in the know ;)
     
  5. Casper98gt

    Casper98gt New Member

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    yeah you need the speedcal. Youre going from a t-45 manual with a speedo gear to a tr3650 with a electronic speedo.
     
  6. scarface

    scarface Guest

    speedcal EXT to be exact.
     
  7. rickzcobra

    rickzcobra Guest

    I have a speed cal on mine for 4.10 gears and it is very accurate.
     
  8. AtlanticCobra98

    AtlanticCobra98 New Member

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    it will also make you mileage reading different...