Swap rear ends or transmission?

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by greaseburner, Apr 2, 2018.

  1. greaseburner

    greaseburner Light Load Member

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    Have a 95 KW W900L quad axle demo dump truck with a 3406 E, 3.55 402 rears . It has 650+ HP, so getting around in that regard isn't a problem, however with the current transmission and rear ends it's just plain geared too high for some of the terrain we run. I'd like to keep the ratio we run in high gear, but would prefer some better ratios for running on dirt than what we have. Any suggestions?

    Thanks
     
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  3. spsauerland

    spsauerland Road Train Member

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    What is current trans?
     
    Last edited: Apr 2, 2018
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  4. Ezrider_48501

    Ezrider_48501 Road Train Member

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    i think a 9LL might be a good choice for that truck. or a 15speed
     
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  5. greaseburner

    greaseburner Light Load Member

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    yup, forgot that I see.

    RTO15715

    Thanks
     
  6. catwrench55

    catwrench55 Light Load Member

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    Only real option for lower gear choices is an 18 speed then.
     
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  7. spsauerland

    spsauerland Road Train Member

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    Are you driving it or hired driver(s)?
     
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  8. swaan

    swaan Road Train Member

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    Rtlo 18 speed.
     
  9. special-k

    special-k Road Train Member

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    Won't low gearin deep reduction in a 15 be almost the same as an 18 in low gear? Can't remember now lol getting old sucks
     
  10. swaan

    swaan Road Train Member

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    If I remember right low low in a 18 is even lower then his 15 and the splits are closer together too. So overall better for what he's doing
     
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  11. KB3MMX

    KB3MMX Road Train Member

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    18 Speed all the way.
    Most versatile trans. Can run as a 9, 13 or 18 ... Love Em.

    A 3.73 or 3.90 rear would be perfect though.
     
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