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Thread: Speedomeer help?

  1. #1
    Join Date
    Jun 2013
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    97

    Speedomeer help?

    When I traded the 92 sc for a 94 F150, the speedometer didn't work. Replaced the speedo for a 145 MPH unit and gears with the better ones from Bill Evanoff. Still doesn't work. 92 M5R2 is in need of a rebuild, so I got a used 94/95 M5R2 from Ryan at the sc shop, and had it put in. I was hoping the speedometer, and odo might work. They don't.
    My question is: What is the usual cause of failure? The sensor in the trans, or maybe the schematic on the back of the gauges, or something else? Does the 95 M5R2 trans work with the 145 MPH speedo? I have tried 3 different gauge clusters, with the same results.

    Thank you,
    Jim JOHN 3:16

  2. #2
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    sounds like the speed sensor in the tail of the trans is bad

  3. #3
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    Quote Originally Posted by 90tbird4.7l View Post
    sounds like the speed sensor in the tail of the trans is bad
    Quite probable.

    Or the gear on the end of it could be worn out.

    Or a loose / corroded plug under the car.

    Does cruise control work?
    God bless!!!

    Former Birds:
    1990 SC auto ... red outside, gray cloth inside ... ~225,000 miles ... Sold.
    1990 SC auto ... white outside, gray cloth inside ... ~150,000 miles ... wrecked.
    1989 Base auto ... Crystal Blue metallic outside, dark blue inside ... ~160,000 miles ... Sold.

  4. #4
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    Jun 2013
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    97

    speedometer help?

    Quote Originally Posted by S_Mazza View Post
    Quite probable.

    Or the gear on the end of it could be worn out.

    Or a loose / corroded plug under the car.

    Does cruise control work?

    No. Cruise never worked either.

  5. #5
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    If cruise never worked, then I think it's probably the VSS or wiring. I would look at the plug on it and go from there. The VSS is not hard to remove from the trans.
    God bless!!!

    Former Birds:
    1990 SC auto ... red outside, gray cloth inside ... ~225,000 miles ... Sold.
    1990 SC auto ... white outside, gray cloth inside ... ~150,000 miles ... wrecked.
    1989 Base auto ... Crystal Blue metallic outside, dark blue inside ... ~160,000 miles ... Sold.

  6. #6
    Join Date
    Jun 2013
    Posts
    97

    speedometer help?

    Quote Originally Posted by S_Mazza View Post
    If cruise never worked, then I think it's probably the VSS or wiring. I would look at the plug on it and go from there. The VSS is not hard to remove from the trans.
    What is the vss? Where is it located exactly?

    Thank you,

    Jim JOHN 3: 16

  7. #7
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    The vehicle speed sensor bolts into the side of the transmission, near the back. There's a plastic gear on the end that meshes with a metal gear inside the transmission.

    This page shows an auto, but manual should be similar.

    http://www.justanswer.com/ford/3boct...sensor-v6.html
    God bless!!!

    Former Birds:
    1990 SC auto ... red outside, gray cloth inside ... ~225,000 miles ... Sold.
    1990 SC auto ... white outside, gray cloth inside ... ~150,000 miles ... wrecked.
    1989 Base auto ... Crystal Blue metallic outside, dark blue inside ... ~160,000 miles ... Sold.

  8. #8
    Join Date
    Jun 2013
    Posts
    97

    speedometer help?

    Quote Originally Posted by S_Mazza View Post
    The vehicle speed sensor bolts into the side of the transmission, near the back. There's a plastic gear on the end that meshes with a metal gear inside the transmission.

    This page shows an auto, but manual should be similar.

    http://www.justanswer.com/ford/3boct...sensor-v6.html
    Where can I get a new sensor for the 95 m5r2?

    Thank you,
    Jim JOHN 3:16

  9. #9
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    The normal parts stores should be able to get them. It's a common sensor.

    http://shop.advanceautoparts.com/p/b...+speed+sensor#

    P.S. - I would look it over before ordering one. Maybe you need a gear, which is not included with a new sensor. Or maybe it's just unplugged, or a wire got pinched.
    Last edited by S_Mazza; 08-13-2014 at 02:15 PM.
    God bless!!!

    Former Birds:
    1990 SC auto ... red outside, gray cloth inside ... ~225,000 miles ... Sold.
    1990 SC auto ... white outside, gray cloth inside ... ~150,000 miles ... wrecked.
    1989 Base auto ... Crystal Blue metallic outside, dark blue inside ... ~160,000 miles ... Sold.

  10. #10
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    Location
    Ottawa Canada
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    FYI they size that gear by diff ratio so speedo is on track.

  11. #11
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    Jun 2013
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    97

    speedometer help?

    Quote Originally Posted by Les Borda View Post
    FYI they size that gear by diff ratio so speedo is on track.
    What gear ratio does the 92 sc have? 2.73:1? Or is there a tag on the dif. cover that would tell me?

    Thank you,
    Jim JOHN 3:16

  12. #12
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    I think there is supposed to be a tag on the diff cover. I didn't know they still did 2:73's in 92 my 90 XR7 had that ratio.

  13. #13
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    Salem OR
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    You should be able to decode the axle ratio from the door tag (assuming it hasn't been changed out, etc.). See: http://www.35thatr.org/VINCodes/tb_ax.htm

  14. #14
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    smart azz..

  15. #15
    Join Date
    Dec 2016
    Location
    Dallas
    Posts
    120

    Speedometer not working

    I have a similar situation. My odometer is working but the speedometer is not working. Today I replaced the VSS, it is located in the rear part of the transmission on the driver side. Is there a way to test the cable? Probably lifting the rear tires and running the engine, I am looking for troubleshooting options.

    Thanks


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