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Rtoo swap

Discussion in 'Trucks [ Eighteen Wheelers ]' started by prerunner404, Nov 29, 2016.

Page 4 of 6
  1. Nov 30, 2016 #31
    spyder7723

    spyder7723 Road Train Member

    15,471
    25,078
    Mar 31, 2013
    sarasota, fl
    0
    Yep. The difference between .62 and. 79 is what? 15 mph?
     
    spyder7723, Nov 30, 2016
    spyder7723, Nov 30, 2016
    #31
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  3. Nov 30, 2016 #32
    prerunner404

    prerunner404 Medium Load Member

    452
    223
    Aug 3, 2011
    lake havasu city az
    0
    Looks like the 18 speed im buying has a .73 final ratio. And im also going to still change my rears out to 3.36. I run a very dedicated route and is 95% flat land and i only have 2 short hills to pull so they will fit my need.
     
    prerunner404, Nov 30, 2016
    prerunner404, Nov 30, 2016
    #32
  4. Nov 30, 2016 #33
    wore out

    wore out Numbered Classic

    17,309
    214,780
    Jun 5, 2013
    CHASIN THE DEVIL'S HERD
    0
    The 3:36 rears will work well with the 18 speed. I have a set in the 379 I just bought. 3406, a 15 over and tall rubber. It is a beast. The 18 should improve upon that
     
    wore out, Nov 30, 2016
    wore out, Nov 30, 2016
    #33
  5. Nov 30, 2016 #34
    prerunner404

    prerunner404 Medium Load Member

    452
    223
    Aug 3, 2011
    lake havasu city az
    0
    I will still be on lp rubber and 22.5's for time being. Once my rear tires wear out ill be going to tall 22.5 to help make up some of the difference top end wise. Unless im happy with the lp rubber and 3.36 gear combo just will have to run her and see.
     
    prerunner404, Nov 30, 2016
    prerunner404, Nov 30, 2016
    #34
  7. Nov 30, 2016 #35
    special-k

    special-k Road Train Member

    1,523
    3,258
    Dec 27, 2008
    Southern Ontario Canada
    0
    Id save your money on the rear end swap until you ran it for awhile. The older engines can rev a little and still get good fuel mileage.
     
    special-k, Nov 30, 2016
    special-k, Nov 30, 2016
    #35
  8. Nov 30, 2016 #36
    wore out

    wore out Numbered Classic

    17,309
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    CHASIN THE DEVIL'S HERD
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    At least 15 lol
     
    wore out, Nov 30, 2016
    wore out, Nov 30, 2016
    #36
    spyder7723 Thanks this.
  9. Nov 30, 2016 #37
    prerunner404

    prerunner404 Medium Load Member

    452
    223
    Aug 3, 2011
    lake havasu city az
    0
    Right now im turning 1650 at 70 mph and still averaging mid 7's on my truck. Shes not afraid of some rpm.
     
    prerunner404, Nov 30, 2016
    prerunner404, Nov 30, 2016
    #37
  10. Nov 30, 2016 #38
    wore out

    wore out Numbered Classic

    17,309
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    Jun 5, 2013
    CHASIN THE DEVIL'S HERD
    0
    KIMG0284.JPG
    3.36 rears tall 24.5's and .79 over drive.
     
    wore out, Nov 30, 2016
    wore out, Nov 30, 2016
    #38
    AModelCat Thanks this.
  11. Nov 30, 2016 #39
    prerunner404

    prerunner404 Medium Load Member

    452
    223
    Aug 3, 2011
    lake havasu city az
    0
    prerunner404, Nov 30, 2016
    prerunner404, Nov 30, 2016
    #39
    wore out Thanks this.
  12. Dec 6, 2016 #40
    kranky1

    kranky1 Road Train Member

    2,253
    8,855
    Sep 16, 2015
    Ontario, Canada
    0
    I was speaking more to the "experts" who deemed the swap a downgrade more than anything. i changed mine to match my cruise rpm with the Province of Onterribles stupid speed limiter. true, i ended up with a slower truck, but i hit 105kph at 1525rpm instead of 1325. My Cat will pull the load running there. i run at 137,500lbs gvw. i gained .75mpg avg with the swap the experts told me was a bad idea.
     
    kranky1, Dec 6, 2016
    kranky1, Dec 6, 2016
    #40
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