Meritor 10spd not going into HI range

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by czego82, Dec 28, 2018.

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  1. Dec 28, 2018 #1
    czego82

    czego82 Light Load Member

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    I have a 1998 Meritor 10 speed. It shifts great but does not go into HI range when switched. Normally when you slip the selector you hear the noise, but now, nothing.
    I drove it home at 20mph for about 30min. After making a stop at the light, and trying to slip to HI range it started to work. I don't want to get stuck in a low range, any idea what it could be? Mechanic told its most likely synchronizer in the back and Meritor makes a kit to fix it. Estmiates $1k for the job...
     
    czego82, Dec 28, 2018
    czego82, Dec 28, 2018
    #1
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  3. Dec 28, 2018 #2
    McMahons Trucking

    McMahons Trucking Light Load Member

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    Do you hear air escaping out of the valve when you switch from low to high range?
     
    McMahons Trucking, Dec 28, 2018
    McMahons Trucking, Dec 28, 2018
    #2
  4. Dec 28, 2018 #3
    czego82

    czego82 Light Load Member

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    no
     
    czego82, Dec 28, 2018
    czego82, Dec 28, 2018
    #3
  5. Dec 28, 2018 #4
    czego82

    czego82 Light Load Member

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    NO
     
    czego82, Dec 28, 2018
    czego82, Dec 28, 2018
    #4
  7. Dec 28, 2018 #5
    McMahons Trucking

    McMahons Trucking Light Load Member

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    Might want to start with the air supply the that valve on the tranny. You should hear air come out of the vent.
     
    McMahons Trucking, Dec 28, 2018
    McMahons Trucking, Dec 28, 2018
    #5
  8. Dec 28, 2018 #6
    25(2)+2

    25(2)+2 Trucker Forum STAFF Staff Member

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    There's a fix for that, someone familiar with Rockwell Meritor , which was very common before about 2005, should be able to put the updated range shift mechanism on it.

    I had one stick in high range, getting it moving is the problem then..

    Another had it stuck in low, he drove a long ways, that way.

    Both were fixed in our company shop, and the one I had lost the fix when they finally replaced the trans with a reman.
     
    25(2)+2, Dec 28, 2018
    25(2)+2, Dec 28, 2018
    #6
  9. Dec 28, 2018 #7
    czego82

    czego82 Light Load Member

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    Replace the Slave Valve Assembly?
     
    czego82, Dec 28, 2018
    czego82, Dec 28, 2018
    #7
  10. Dec 28, 2018 #8
    McMahons Trucking

    McMahons Trucking Light Load Member

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    Yes. It might need replaced or cleaned out. I would replace it with a new gasket. I think they are about 100 bucks
     
    McMahons Trucking, Dec 28, 2018
    McMahons Trucking, Dec 28, 2018
    #8
  11. Dec 28, 2018 #9
    czego82

    czego82 Light Load Member

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    If the synchro was bad, would there be air noise?
     
    czego82, Dec 28, 2018
    czego82, Dec 28, 2018
    #9
  12. Dec 28, 2018 #10
    McMahons Trucking

    McMahons Trucking Light Load Member

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    Synchronizer is internal to the tranny. The valve is on the back external.
     
    McMahons Trucking, Dec 28, 2018
    McMahons Trucking, Dec 28, 2018
    #10
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