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Hi to Low grind - 13 speed

Discussion in 'Trucks [ Eighteen Wheelers ]' started by 01blackz28, Jun 13, 2012.

  1. Jun 13, 2012 #1
    01blackz28

    01blackz28 Light Load Member

    150
    19
    Oct 29, 2011
    0
    Back half of the transmission was just redone 18,000 miles ago. The trans is grinding from high to low. Tried both preselecting and going to the low side once the shifter goes to neutral : grinds both ways. My question is - Did I do something wrong to mess this up? If you think about it the transmission goes from hi to low basically by itself. What are some of your opinions? Was it not put together correctly? It was not put back with genuine EATON FULLER parts.
     
    01blackz28, Jun 13, 2012
    01blackz28, Jun 13, 2012
    #1
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  3. Jun 13, 2012 #2
    country29

    country29 Medium Load Member

    518
    156
    Feb 27, 2010
    Arkansas
    0
    synchronizer is bad, or when it was rebuilt if the bull gear that the synchro slides into was not replaced it could have eaten the syncro up. Or it could be just bad parts, either way its got to come back apart, and I highly recommend going back with eaton parts.
     
    country29, Jun 13, 2012
    country29, Jun 13, 2012
    #2
  4. Jun 13, 2012 #3
    01blackz28

    01blackz28 Light Load Member

    150
    19
    Oct 29, 2011
    0
    bull gear was not replaced. eaton parts for sure.
     
    01blackz28, Jun 13, 2012
    01blackz28, Jun 13, 2012
    #3
  5. Jun 13, 2012 #4
    poppapump1332

    poppapump1332 Road Train Member

    2,987
    2,462
    Jan 2, 2010
    birdsboro,pa
    0
    Synchronizer is bad
     
    poppapump1332, Jun 13, 2012
    poppapump1332, Jun 13, 2012
    #4
  7. Jun 13, 2012 #5
    bender

    bender Road Train Member

    2,105
    1,348
    Jul 20, 2010
    Don't Kid Yourself
    0
    You might also check your air regulator pressure to the range valve. If the pressure is high to the range cylinder it will cause rapid wear to the syncronizer and heavy shift engagement.
     
    bender, Jun 13, 2012
    bender, Jun 13, 2012
    #5
  8. Jun 14, 2012 #6
    country29

    country29 Medium Load Member

    518
    156
    Feb 27, 2010
    Arkansas
    0
    yep, almost forgot about checking regulator pressures been busy working on isx's instead of trans!
     
    country29, Jun 14, 2012
    country29, Jun 14, 2012
    #6
  9. Jun 15, 2012 #7
    Gear head

    Gear head Medium Load Member

    532
    91
    Apr 1, 2012
    Belair,md
    0
    Back half of trans can be removed without pulling trans. I have done it. I have rebuilt these trans. U need the right jack. It is the sincro. In back half.
     
    Gear head, Jun 15, 2012
    Gear head, Jun 15, 2012
    #7
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