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Thread: Speedometer Off

  1. #16
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    Quote Originally Posted by LURKER99 View Post
    Just the axles both sides because the driver side bearing seal went bad as always on my model, so they replaced both axles and serviced the diff. it was just the TSB kit.
    What was the symptom of the bad bearing seal? Leaking? Squeeking? Something worse?


    Previous owner of...

    BLACK '03 300A "Bagheera"
    Ford Racing 4:10's
    Denso Iridium plugs
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    Hitch

  2. #17
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    Easy way:
    Just look at the tach and reference this spreadsheet.
    http://www.magindat.net/ssm/info/4r70wratios.xls
    No math.

    Hard way:
    Mark the tire with tape. Jack up the rear. Mark the DS. Put car in N. Turn the tire 1 rev. Count DS revs. No math there, either.
    Magindat: (majin-dat) Imagine That.
    2013 Ford Taurus SHO

    Lemonade - living with Fruit Punch - in Blackmobile's Garage...
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    #1649
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  3. #18
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    Quote Originally Posted by LURKER99 View Post
    my speed was off by 10mph,
    No such thing. Speed can't be off by an even amount. Are you going 0 and it says 10?! It's off by a proportion, often stated as an amount per 10mph.

    4.10's will put you off at about 1.5mph per 10mph. If you are actually going 70, speedo will say 80.5. (1.5/10 x 70 + 70) or (70x1.15)

    Test in 3rd (OD off) on the highway at 70 since this is 'straight through' 1:1 ratio in the trans.

    4.10 rpm should be 3463
    3.55 rpm should be 2999
    3.73 rpm should be 3151
    4.30 rpm should be 3632
    Magindat: (majin-dat) Imagine That.
    2013 Ford Taurus SHO

    Lemonade - living with Fruit Punch - in Blackmobile's Garage...
    FIT Procharger Kit #31 - 3.7 pulley - 9 PSI
    World's first BLOW THRU ProCharged Marauder - Reinhart Tuned

    #1649
    boi

  4. #19
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    Thanks for all the help guys!!!
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  5. #20
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    You can also use an online gear calculator (similar to the spreadsheet), with the following information:

    Revolutions per Mile = 724 (Stock)
    Redline (RPM) = 6000
    First Gear = 2.84
    Second Gear = 1.55
    Third Gear = 1.0
    Fourth Gear = 0.7

    Note your RPM at a fixed speed and vary the Axle Ratio value to determine what you have.

  6. #21
    Quote Originally Posted by LURKER99 View Post
    I have a 03 300A @ 60k, I bought the MM used a little over a year ago @ 34k. When I bought it I noticed my speed was off by 10mph, if the speedometer read 80mph then I'm only going 70mph. My tire size is still at factory standards, the only thing I could come up with is that I could possibly have 4:10s already installed from previous owner and they just didn't get it tunned for the 4:10s! I plan to check the driveshaft this weekend for the 4:10s but if it's not that, any suggestions or has anyone else out there had this problem?? Thanks
    If it is off by 10 MPH I would say the axle ratio is off in the tuning, the car may have a tune in it, or it may have been returned to stock before the previous owner sold it and it does have 4:10 in it.

  7. #22
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    Why are we digging up dead threads today?

  8. #23
    Quote Originally Posted by rauder88 View Post
    Why are we digging up dead threads today?

    It was my mistake so just disregard it.

  9. #24
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    Quote Originally Posted by Dennis Reinhart View Post
    It was my mistake so just disregard it.
    Thought you were going on another old thread kick like we did a couple months ago.

    If so, here's one for you to check out...

    http://www.mercurymarauder.net/forum...hread.php?t=21

    Lotta water under the bridge since then, huh? ----->

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    Build date: 6/19/03
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  10. #25
    LOL I never knew that was still here, this was the first chip and performance modification for the Marauder.
    Last edited by Dennis Reinhart; 05-04-2011 at 08:39 AM. Reason: typo

  11. #26
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    Apr 2004
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    Quote Originally Posted by Dennis Reinhart View Post
    LOL I never knew that was still here, this was the first chip and performance modification for the Marauder.
    Like I was saying, lots of changes since then...

    2003 300B DBP
    Build date: 6/19/03
    Number 7,792 of 7,838 - 326 of 328
    Proud member of the MM "BLUES" Bros.
    Purchased: 11/10/05
    Eaton swap by ImpalaSlayer 11-09-10

    Semper et in Aeternum, Mercurius.

    In Memory:
    2004 DTR
    Build Date 01/27/04
    Purchased 04/04/04
    Wrecked 10/19/05, R.I.P.



  12. #27
    Join Date
    Apr 2007
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    Fort Lauderdale,Fl
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    Quote Originally Posted by LURKER99 View Post
    I have a 03 300A @ 60k, I bought the MM used a little over a year ago @ 34k. When I bought it I noticed my speed was off by 10mph, if the speedometer read 80mph then I'm only going 70mph. My tire size is still at factory standards, the only thing I could come up with is that I could possibly have 4:10s already installed from previous owner and they just didn't get it tunned for the 4:10s! I plan to check the driveshaft this weekend for the 4:10s but if it's not that, any suggestions or has anyone else out there had this problem?? Thanks
    Omg that car is a BABY!!! My girl is at 155K

  13. #28
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    Fort Lauderdale,Fl
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    Oh yeah.... This is a dead thread... WHOOOOPS!

  14. #29
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    If you have sct programmer plug it in and go into program and to gear ratio and choose 4.10 and test it, if its still not good try 3.73 if no good also try all the options until it's corrected, if is there no good in that it should be something other than programing.

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  15. #30
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    Quote Originally Posted by M91 View Post
    If you have sct programmer plug it in and go into program and to gear ratio and choose 4.10 and test it, if its still not good try 3.73 if no good also try all the options until it's corrected, if is there no good in that it should be something other than programing.

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