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Question about 4wd operation

Discussion in 'Technical Chat' started by Badwin45, Jul 7, 2010.

  1. Jul 7, 2010 at 4:57 PM
    #1
    Badwin45

    Badwin45 [OP] Well-Known Member

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    Chris
    OKC
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    Aries 4" Oval step tubes, Aries bull bar, Hella 500FF driving lights, Weathertech digifit floor liners.
    After lurking around I think I have a good idea of how the VSC/Auto-LSD work but I still have a couple of questions about the operation of my 2010 DC 4x4 (SR5 package):

    1) Is the front differential "open"?

    2) Why would it require more throttle input when making sharp turns in 4wd? It feels like the truck is trying to push through the turn. I don't recall my last 4x4 doing this. (of course that was 18 yrs ago...)

    Thanks,
    Chris
     
  2. Jul 7, 2010 at 5:02 PM
    #2
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Staff Member

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    FlimFlubberJAM
    Tenoe, AZ
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    4.10 gears, sliders, and lots of buttons.
    The ffront is an Open diff. The drive train binds when turning in 4 wheel drive. Its normal. Dont use 4 wheel drive on pavement/concrete.
     
  3. Jul 7, 2010 at 5:08 PM
    #3
    Badwin45

    Badwin45 [OP] Well-Known Member

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    Aries 4" Oval step tubes, Aries bull bar, Hella 500FF driving lights, Weathertech digifit floor liners.
    So in 4H I essentially have 2 open diffs?

    Hooray :(
     
  4. Jul 7, 2010 at 5:11 PM
    #4
    Yoytoda

    Yoytoda The Little Truck That Could

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    Roland
    Big Bear,CA / Upstate NY(Saratoga)
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    completely stock

    no you have auto lsd front and rear in 4hi. Essentially you have LSD front and rear.

    The diffs are open, but when one tire spins the brakes are applied to that wheel to transfer power to the other tire.

    not like a clutch type mechanical LSD but same concept. instead of internal clutch it uses the brakes to transfer pwer
     
  5. Jul 7, 2010 at 5:11 PM
    #5
    whippersnapper02

    whippersnapper02 Well-Known Member

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    The reason you can't turn in 4wd is because the front and rear tires spin at different speeds. If the front and rear tires followed the same path they wouldn't spin at different speeds. Since a 4wd vehicle has no center differential like a AWD vehicle the front and rear wheels can't spin at different speeds.
     
  6. Jul 7, 2010 at 5:14 PM
    #6
    Yoytoda

    Yoytoda The Little Truck That Could

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    ^^^^BINGO^^^^

    on another note, follow the 4lo trac in my sig to a how to on making TRAC work in 4Lo. LSD front and rear in 4lo...unstoppable
     
  7. Jul 7, 2010 at 6:15 PM
    #7
    Badwin45

    Badwin45 [OP] Well-Known Member

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    '10 DC 4x4 & '00 Pre-Runner
    Aries 4" Oval step tubes, Aries bull bar, Hella 500FF driving lights, Weathertech digifit floor liners.
    Thanks guys, I think this is starting to make sense...

    I believe the problem is that I took 3 years of latin in high school and the manual is written in greek.

    Let's see if I have this straight.
    In 2wd, the rear diff is open unless I engage Auto LSD.
    In 4wd, Auto LSD is ON thus giving me a virtual LSD.

    whippersnapper02: Thanks, that makes sense.
     
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