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What speedometer is used with M46 and 3.31 rear 200

posted by  dobber13 on  Wed Jan 15 20:19 CST 2014
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last visit: Sat Oct 18 19:10 CST 2014
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Have a 84 244ti and replaced from auto trans. to M46,also replaced 3.91 rear to 3.31. What manual speedometer should be used?








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    What speedometer is used with M46 and 3.31 rear 200

    posted by  dobber13 on  Wed Jan 22 21:15 CST 2014
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    last visit: Sat Oct 18 19:10 CST 2014
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    Well I should have said how I thought my speedometer was 3 mph higher I got that off one of those speed signs that tell you how fast you are going.The other day I was in my son's car and sign showed the same thing 3 mph faster.

    Well I guess you can't trust those speed signs,I should have just checked the odometer mile post to mile post.
    Thanks for your replies,
    Charlie








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    What speedometer is used with M46 and 3.31 rear 200

    posted by  Volvodad on  Thu Jan 16 00:27 CST 2014
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    last visit: Thu Oct 23 16:18 CST 2014
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    Look for a speedo head with r 0,980 in small white print on the face. That is what is in my 83 with M46/3.31. Another factor could involve the speedo drive gearing in the tail of the OD unit, if the trans came from an older 240 with a lower geared (higher numerically) axle.

    Volvo parts dept used to carry a range of replacement little nylon gears for the drive...they may not after 20+ years since the last new 240, and probably longer since the last M46.
    --
    Bob: Son's XC70, my 83 240, 89 745 (V8) and S90. Also '77 MGB and some old motorcycles








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      What speedometer is used with M46 and 3.31 rear 200

      posted by  dobber13 on  Fri Jan 17 21:30 CST 2014
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      last visit: Sat Oct 18 19:10 CST 2014
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      I know my speedo is a r0,980,the M46 has a 20 tooth gear was from a 84 240 and the 3.31 rear came out of a 88-89 240.
      The speedometer is reading 3mph more then it should.








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        What speedometer is used with M46 and 3.31 rear 200

        posted by  Volvodad on  Sat Jan 18 13:35 CST 2014
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        last visit: Thu Oct 23 16:18 CST 2014
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        If your M46 came from a non-turbo 1984 car, that car had a 3.31 axle. Turbos had 3.73 with the M46.

        A 3MPH error is a little more than one would expect (at what speed, tho'?), but the real test for proper speedo gearing is the odometer. What does it read compared to a known accurate distance? If it is accurate, then the speedo head magnet/spring combo needs to be calibrated.

        I sent my 1983 Speedometer head to Palo Alto Speedometer who did a nice job. It came back dead accurate and looking like new. (www.paspeedo.com)
        --
        Bob: Son's XC70, my 83 240, 89 745 (V8) and S90. Also '77 MGB and some old motorcycles








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          What speedometer is used with M46 and 3.31 rear 200

          posted by  dobber13 on  Sat Jan 18 20:32 CST 2014
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          last visit: Sat Oct 18 19:10 CST 2014
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          60 mph,I will have to check the odometer out.What did it cost for the calibrating?








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            What speedometer is used with M46 and 3.31 rear 200

            posted by  Volvodad on  Sat Jan 18 22:44 CST 2014
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            last visit: Thu Oct 23 16:18 CST 2014
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            10+ years ago so can't remember and undoubtedly more now. Email them and ask.
            --
            Bob: Son's XC70, my 83 240, 89 745 (V8) and S90. Also '77 MGB and some old motorcycles








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        What speedometer is used with M46 and 3.31 rear 200

        posted by  Trev29 on  Sat Jan 18 06:09 CST 2014
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        last visit: Fri Oct 17 05:56 CST 2014
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        "The speedometer is reading 3mph more then it should."

        At what speed?

        You may be able to switch in an electronic speedo as your rear drive is equipped for one.
        --
        1980 245 Canadian B21A with SU carb, M46 trans, 3:31 dif, in Brampton, Ont.








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    What speedometer is used with M46 and 3.31 rear 200

    posted by  Volvo4dv8 on  Wed Jan 15 22:34 CST 2014
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    last visit: Thu Oct 23 20:06 CST 2014
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    As far as I know the 3.31 was in place after the Mechanical spedo's were stopped.
    How is taking off in first with the 3.31?








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      What speedometer is used with M46 and 3.31 rear 200

      posted by  dobber13 on  Thu Jan 16 17:06 CST 2014
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      last visit: Sat Oct 18 19:10 CST 2014
      [RELATED]

      Not bad with the turbo,but I may go to a 3.73 better or even better 3.54 if I ever find one. 3.73 would be alot better with the turbo lower end.
      Some people think the 3.31 and M46 is the best match because of better highway MPG. But driving around town to me it sucks,always shifting.







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