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9ll trans to 8ll trans

Discussion in 'Trucks [ Eighteen Wheelers ]' started by earthmover, Jan 17, 2013.

  1. Jan 17, 2013 #1
    earthmover

    earthmover Medium Load Member

    563
    20
    Jan 27, 2009
    castalia , north carolina
    0
    what kinda change will I see if I do this???? the only gear that is diff. is on the lolo side????????will my mpg go down????
     
    earthmover, Jan 17, 2013
    earthmover, Jan 17, 2013
    #1
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  3. Jan 17, 2013 #2
    CatPowerC15

    CatPowerC15 Medium Load Member

    347
    90
    Feb 18, 2010
    Siler City, NC
    0
    I've never seen a 9 double L, only 8.
     
    CatPowerC15, Jan 17, 2013
    CatPowerC15, Jan 17, 2013
    #2
  4. Jan 17, 2013 #3
    SL3406

    SL3406 Medium Load Member

    550
    1,482
    Jan 10, 2011
    Oklahoma
    0
    The 8LL and 9LL are the same ratio in high gear assuming they're both overdrive transmissions so mileage will be the same. 9LL are used mostly in concrete trucks.
     
    SL3406, Jan 17, 2013
    SL3406, Jan 17, 2013
    #3
  5. Jan 17, 2013 #4
    earthmover

    earthmover Medium Load Member

    563
    20
    Jan 27, 2009
    castalia , north carolina
    0
    thanks my truck has a 9ll in it now and having trouble with 1/5 gear found a 8ll from a buddy at a great price.....its all in a heavy spec dump truck....
     
    earthmover, Jan 17, 2013
    earthmover, Jan 17, 2013
    #4
  7. Jan 17, 2013 #5
    Down under trucker

    Down under trucker Light Load Member

    145
    62
    Jun 22, 2012
    Brisbane, Australia
    0
    Depending if the 8ll is an overdrive because they did make some that had a 1:1 final ratio, but I think they where just low torque models. If not the are both .73:1 final ratio so you won't loose any mpg.
    You will loose the lo lo though because I think 8ll are about 19:1 overall ratio and the 9ll is 26:1 so you won't be able the split 1st gear.

    What problems are you have with it
     
    Down under trucker, Jan 17, 2013
    Down under trucker, Jan 17, 2013
    #5
  8. Jan 17, 2013 #6
    earthmover

    earthmover Medium Load Member

    563
    20
    Jan 27, 2009
    castalia , north carolina
    0
    had a driver leave for work worked all day then parked the truck and went home..called back hr. later and said oh I forgot to tell you the truck want stay in 1 or 5 gear....it kicks out of gear some times it will stay in 1st for a min or so then kick it again........
     
    earthmover, Jan 17, 2013
    earthmover, Jan 17, 2013
    #6
  9. Jan 18, 2013 #7
    kwforage

    kwforage Road Train Member

    1,047
    472
    Jun 3, 2007
    Wisconsin
    0
    The only 8LL's that are direct drive are 900ft lbs or less. Don't ask me how I know. Had one in my truck for a few weeks. I'm sure the one he has is an O.D.
     
    kwforage, Jan 18, 2013
    kwforage, Jan 18, 2013
    #7
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