18 speed transmission

Discussion in 'Peterbilt Forum' started by Loaderlou, Apr 28, 2014.

  1. Loaderlou

    Loaderlou Medium Load Member

    342
    130
    Feb 24, 2014
    0
    Why does my transmission shift rough when I split my high range gears 5th thru 7th? When I split up and let off the fuel it grabs pretty hard, but if I split up and take the stick out of gear and put it back in its fine. Could it be the valve on the back of the tranny?
     
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  3. Rodeoman7

    Rodeoman7 Light Load Member

    98
    37
    May 27, 2008
    Middle of Nowhere, CO
    0
    Two speed is going out.
     
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  4. Lucar

    Lucar Road Train Member

    1,396
    889
    Aug 22, 2012
    Texas
    0
    Replace synchronizer quick.
     
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