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Need advice on rearends

Discussion in 'Peterbilt Forum' started by Bulldawg81, Apr 9, 2016.

  1. Apr 9, 2016 #1
    Bulldawg81

    Bulldawg81 Bobtail Member

    1
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    Apr 9, 2016
    0
    Have a 1995 379 Pete with a detroit 60 500 horse with a 13 sp eaton fuller truck has 390 gears but tor the driveshaft out n it screwed up the rear differential I have two options at my disposal a set of 411's or 355's with my 390 I am good on flat ground at 70 I am taching bout 1600 when it starts pulling a hill it loosing alot like I said just need g opions from other owner ops
     
    Bulldawg81, Apr 9, 2016
    Bulldawg81, Apr 9, 2016
    #1
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  3. Apr 9, 2016 #2
    Old Man

    Old Man Road Train Member

    4,597
    13,470
    Apr 3, 2009
    Oklahoma City, OK
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    355 is ok, 411s will eat your fuel.
    Eaton has a gear and road speed calculator on their site.
     
    Old Man, Apr 9, 2016
    Old Man, Apr 9, 2016
    #2
  4. Apr 10, 2016 #3
    Bean Jr.

    Bean Jr. Road Train Member

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    Mar 30, 2014
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    Yeah if you're bumping 1600 with 3.90s, you'll be about 1700 with 4.11s
     
    Bean Jr., Apr 10, 2016
    Bean Jr., Apr 10, 2016
    #3
  5. Apr 10, 2016 #4
    beemergary

    beemergary Light Load Member

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    Apr 11, 2014
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    Got to know your sweet spot of motor. Lugging will burn fuel-over revving with extra power uses fuel.
     
    beemergary, Apr 10, 2016
    beemergary, Apr 10, 2016
    #4
  7. Apr 22, 2016 #5
    prerunner404

    prerunner404 Medium Load Member

    452
    223
    Aug 3, 2011
    lake havasu city az
    0
    I have the same truck but 3.70s lp 22.5 rubber and a 10 speed. With this current set up im running around 1600 at 70mph. My truck was speced for tall 24.5's so i actually have to drive 5mph faster to do the speed i want. With that being said if i had tall rubber on 24.5's and my 3.70 rears at 70 mph id be running around 1450-1500 rpm and for my truck thats right where she is happy at and where the motor really likes to start pulling.
     
    prerunner404, Apr 22, 2016
    prerunner404, Apr 22, 2016
    #5
  8. Apr 22, 2016 #6
    rabbiporkchop

    rabbiporkchop Road Train Member

    9,677
    6,526
    Feb 9, 2012
    Wapwallopen, Pa
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    Bite the bullet and get an 18-speed and keep 355 gears
     
    rabbiporkchop, Apr 22, 2016
    rabbiporkchop, Apr 22, 2016
    #6
  9. May 8, 2016 #7
    savage02

    savage02 Light Load Member

    163
    50
    Dec 21, 2007
    Upstate, NY
    0
    Going from a 13spd to an 18spd will do nothing for him. I run that engine myself and from my experience I'd go with the 4.11's in your case. You'll only be 50rpm higher in your gears. It will be a total dog with the 3.55's unless you swap down to low pro tires. I run 295/75/22.5 with a 13spd and 3.58's and its around 1550rpm@70mph.
     
    savage02, May 8, 2016
    savage02, May 8, 2016
    #7
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