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Trouble with an untrashift and rear end question ..

Discussion in 'Freightliner Forum' started by grassy, Jul 7, 2015.

  1. Jul 7, 2015 #1
    grassy

    grassy Bobtail Member

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    Jul 7, 2015
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    I have a fl60 with a 6 speed as/2 untrashift in it,...I *know* I am not an 18 wheeler but support is hard to find..

    I am having probs with reverse..once I start using it, it freezes..makes it a bi*ch to back up. I have to disconnect battery to make it work again and it goes into the same cycle..best we can figure out is that it is over heating ??? Changed some wires... told to go into freightliner,..sounds expensive...any ideas or do I just bite the bullet ?

    The max weight I am pulling is 12K and I have 4:11 rear ratio. I am running 2K in 6th at around 65 mph. Can I drop the rear end ratio to get a few more MPHs ? ..or will it kill the up hill pulling power ?

    Thanks//
     
    grassy, Jul 7, 2015
    grassy, Jul 7, 2015
    #1
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  3. Jul 7, 2015 #2
    KB3MMX

    KB3MMX Road Train Member

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    Dec 29, 2014
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    What engine and power rating now?
    You could definetely drop the rears down with lightweight loads like that. I'd say 3.55 or 3.73.
    If you need more power, there's plenty of companies that can uprate truck engine computers.
    And just get the truck into the shop to fix that trans, sounds like a royal pain.
     
    KB3MMX, Jul 7, 2015
    KB3MMX, Jul 7, 2015
    #2
  4. Jul 7, 2015 #3
    grassy

    grassy Bobtail Member

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    Jul 7, 2015
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    Sorry. I am running a 3126b - 300 hp / 800 torque.
    That will give me an extra 10 MPH ? But will it force me to run one gear lower in 55 mph ?

    Thanks
     
    grassy, Jul 7, 2015
    grassy, Jul 7, 2015
    #3
  5. Jul 7, 2015 #4
    KB3MMX

    KB3MMX Road Train Member

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    Dec 29, 2014
    Orrstown, PA
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    With power you'll be fine. There are pickups pulling more than you at lower rpms.
    Check out PDQ diesel performance, they have ecm tuning for your cat

    At 55 you should be able to ease up the road no problem at 1400-1500rpm.
     
    KB3MMX, Jul 7, 2015
    KB3MMX, Jul 7, 2015
    #4
  7. Jul 8, 2015 #5
    grassy

    grassy Bobtail Member

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    Jul 7, 2015
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    Thanks !
     
    grassy, Jul 8, 2015
    grassy, Jul 8, 2015
    #5
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