2.64 gear ratio?

Discussion in 'Refrigerated Trucking Forum' started by howardx, Mar 16, 2016.

  1. Cascadia2020

    Cascadia2020 Bobtail Member

    10
    4
    Mar 16, 2019
    0
    Yes you are correct, I found out it is direct drive, truck was ordered by Seneca they bought 25 out of 26 trucks, so I got this one, they pull heavy loads and use direct drive transmissions. I was told this tranny is better than od tranny. Plus they ordered tricks with 2.64 rear end with 24.5 tires. Since they canceled freightliner changed some things in it. 2.64 to 2.47 ratio and tires.
     
    KB3MMX Thanks this.
  2. Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.

  3. KB3MMX

    KB3MMX Road Train Member

    3,057
    2,572
    Dec 29, 2014
    Orrstown, PA
    0
    Direct is very Sightly better in efficiency (1.5-2% +/-) that's why some people think they're better... Which in that case they can be.

    With a 2.64, your ideal transmission would be the OD unit for 80K loading and down on highways 65+ mph.

    For direct, that 2.64 rear is a bit to much RPM if it's a 65+ mph highway truck... 62 may have been their max speed by the ordering company?

    This is in consideration of the engine TQ band ..... Different motors with higher rpm needs will be setup different for optimization
     
  4. 25(2)+2

    25(2)+2 Trucker Forum STAFF Staff Member

    18,677
    43,103
    Sep 18, 2006
    the road less travelled
    0
    I ran a 2.64 direct for quite awhile, for a 12.7, it was too tall, imo.

    The double over with a 3.42 seems to be about the same engine rpm per mph in top gear.
     
    KB3MMX Thanks this.
  5. Cascadia2020

    Cascadia2020 Bobtail Member

    10
    4
    Mar 16, 2019
    0
    I'm running 70mph at 1500rpm with 2.47. Keeping it there I get hair over 7mpg. I'm happy with that.
     
    KB3MMX Thanks this.
  6. 25(2)+2

    25(2)+2 Trucker Forum STAFF Staff Member

    18,677
    43,103
    Sep 18, 2006
    the road less travelled
    0
    The Evolution with 3.25 and od 10 speed runs 1400 at 70, 5 mph per 100 engine rpm.

    I've not run more than regional, and sometimes pull a livehaul, so the only thing I'm certain of is its doing better than the 2013 with same transmission and 3.42 rears.
     
    KB3MMX Thanks this.
  7. KB3MMX

    KB3MMX Road Train Member

    3,057
    2,572
    Dec 29, 2014
    Orrstown, PA
    0
    Engine and it's unique/specific TQ curve has a lot to do with it..
    Some of the newer motors can do great at much lower RPMs while others can't... Even in the same engine family...but different power curve specs
     
    Bean Jr. Thanks this.
  8. pmiranda0621

    pmiranda0621 Bobtail Member

    1
    0
    Dec 10, 2022
    0
    I’m looking to but a truck spec’d like this can anyone can I get your thoughts X15 565HP 18spd manual 2.64
     
  • Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.