Mostly street 4x4 care

Discussion in 'GM Powertrain' started by Z07, Aug 13, 2009.

  1. Z07

    Z07 Member

    I rarely drive on anything other than well-maintained roads. I try to remember to shift into 4H once in a while just to keep things stirred up in the t-case and front diff. Is that a good thing? should I also use 4L for a bit too?

    How often and for how long should I shift into 4WD just so that when the time comes that I need it it is available?
     
  2. Jimmiee

    Jimmiee Epic Member 5+ Years 1000 Posts

    It is a good idea to do this as it lubricates the parts that are not turning as well as the motor parts. You should this once every 3 months IMO. It doesn hurt to shift it into low range as well. You don't need to drive it more than a half block and you should not drive it more than that on the pavement.
    The worst thing you can do to a transfer case id to leave it in 2 high for a year or more. The contacts in the switches and motor can become contaminated with fine particulate and this is what causes them to fail.
     
  3. 2COR517

    2COR517 Epic Member 5+ Years 1000 Posts

    I agree with Jimmiee (got it right this time). Also be sure to check your case fluid regularly. If you have never changed it, do so. Reg ATF has a problem with misting off. You can run your case empty pretty easily. The best fluid to use is fully synthetic manual transmission lube. I am presuming you don't have the autotrac case.
     
  4. masterfoxscout

    masterfoxscout Rockstar ROTM Winner 100 Posts

    What about us with the Autotrac?
     
  5. Jimmiee

    Jimmiee Epic Member 5+ Years 1000 Posts

    The NP149 & NP246 are a little different in that the front drive and chain are always turning. So the lube problem doesn't exist in these transfer cases. However the motor problem is worse because these cases have clutches and more moving parts to create fine metal particulate. So I would cycle my motor every 3 months on these cases as well. Also if I had an autotrac transfer case I would service it more often even though the fluid looks good. Again JMO.

    You see a lot of motor failures on electric shift transfer cases and what's peculiar is the less you use the motor the more likely it is to fail. :)
     
  6. masterfoxscout

    masterfoxscout Rockstar ROTM Winner 100 Posts

    Well, living in Alaska is a benefit....we drive in 4WD for 8 months out of the year.
     
  7. Z71_guy

    Z71_guy Epic Member 5+ Years 1000 Posts


    How is it up there, i may be moving to Fort Greely near delta junction
     
  8. moosetags

    moosetags Rockstar 100 Posts

    I don't do much off roading except on the beach which often requires 4L. I do try to put the old girl in 4H pretty often for short periods to keep the lubricants circulating. I also use 4H pretty often when pulling the 7500# Airstream on slippery surfaces like muddy campground roads. I once had the trailer start to pull the Suburban backwards down a steep grade on a mud slicked paved surface.

    I stay pretty on top of servicing the front differential. I do this about every 15,000 miles when I service the Quadrasteer.

    Brian
     
  9. masterfoxscout

    masterfoxscout Rockstar ROTM Winner 100 Posts


    I love it. I've been stationed in Fairbanks for over 7 years now. I will say that out in Delta, it's pretty quiet and there is really nothing out there other than a couple gas stations and a grocery store...but Fort Greely is quite nice. I'd live there.
     

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