450 hp, direct drive 10 spd.,253 gear ratio

Discussion in 'Trucks [ Eighteen Wheelers ]' started by inthewind379, Mar 24, 2013.

  1. Mar 24, 2013 #1
    inthewind379

    inthewind379 Bobtail Member

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    Mar 17, 2013
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    Looking for input on this set up.
    Dealer has a bunch of these trucks on trade from Conway truckload. I asked the dealer if they changed anything on the new trucks ordered and he said they didn't change a thing, so the set up must work for them.
    these are also tag axle trucks with claimed ECM mileage from 7.5 to 9.1 mpg
    The problem is they are 2010 ISX
    Conway wanted to keep the super singles so they swapped them out with the duals from the new trucks.
    I dont think Conway hauls a lot of 40000 lb. loads but this set up must be capable of pulling that weight,
    I have read threads about direct drive and high rear ratios but usually with 13 or 18 spd.
    Any input would be appreciated.
     
    inthewind379, Mar 24, 2013
    inthewind379, Mar 24, 2013
    #1
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  3. Mar 24, 2013 #2
    allan5oh

    allan5oh Road Train Member

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    It wouldn't be much different than a 3.42 or 3.55 ratio with overdrive 10 speed. A direct drive 10 speed has more aggressive gearing to make up for the lack of gearing out back.


    For fuel mileage, there isn't a better setup.

    What kind of trucks are they?
     
    allan5oh, Mar 24, 2013
    allan5oh, Mar 24, 2013
    #2
  4. Mar 24, 2013 #3
    inthewind379

    inthewind379 Bobtail Member

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    Mar 17, 2013
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    2010 T660 with ISX , sounds like the good mpg could make part of the payment , but I found a thread on here with a reference about the Conway truckload tag axle trucks with the fixed fifth wheel and weight transfer for traction on single drive axle, also said Conway went to 42" king pin on all there trailers to solve the problem, I find it hard to believe they replaced the entire trailer pool for these trucks.
     
    inthewind379, Mar 24, 2013
    inthewind379, Mar 24, 2013
    #3
  5. Mar 24, 2013 #4
    Cowpie1

    Cowpie1 Road Train Member

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    Well, it has been a long, long time since I was associated with the root carrier of Conway Truckload, Contract Freighters Inc. If they are doing anything remotely similar to their old CFI days, they pull some heavy stuff often enough. Don't confuse Conway Truckload with the LTL Conway, though they are owned by the same parent outfit and the truckload side does haul some of the other stuff. It still primarily deals with the same stuff most other dry box outfits haul. The folks at the Truckload side have always been pretty good about spec'ing decent mpg equipment. I would not doubt good mpg, but remember that what they are telling you is ECM mpg and not IFTA mpg. Keep in mind someone is selling a truck and will use data that is verifiable on an ECM dump, but may not be the actual pump to pump mpg. I would subtract at least .5 mpg from what they say a truck is getting.
     
    Cowpie1, Mar 24, 2013
    Cowpie1, Mar 24, 2013
    #4
  7. Feb 17, 2017 #5
    russtrucker

    russtrucker Road Train Member

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    That powertrain spec existed at fedex freight before they switched to bs automatic for that cummins smartadvantage.
     
    russtrucker, Feb 17, 2017
    russtrucker, Feb 17, 2017
    #5
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