Welcome to the H4O - HUMMER 4x4 Off Road.
Results 1 to 8 of 8
  1. #1
    Bald Tire
    Join Date
    Oct 2019
    Location
    White Mtns, AZ
    Posts
    5
    Thanks
    0
    Thanked 0 Times in 0 Posts

    4X4 system acts like it's in neutral when in AWD

    OK, Hope somebody can help me with this cuz my trouble shooting brain is out of ideas. I recently replaced the crappy plastic fork in my Trans Case due to NOT Shifting out of 4 hi lock. the light would change but i was still in 4hi lock. the plastic fork was definitely the culprit. Now it clearly shifts in and out of All Time 4 to 4 Hi Lock, and to 4 Lo Lock. It seems like that part is working.....However

    .....Now i have a new problem. when i select All time 4, the light switches but truck is in Neutral (no matter what gear i put it in). When i switch to 4 hi lock, the light switches to 4 hi and can then engage the transmission (drive forward and reverse). then when i switch it back to All Time 4 it is in neutral again....you can hear the trans spinning (slightly) and when you shift into any gear it is still in neutral. Actually i discovered that the whole transmission is disconnect (in neutral). I switch to All TIme 4, light comes on, shift into drive, take my foot off the brake and the truck roll backwards (my driveway is on a slight hill).
    So this is clearly a different problem

    A few things you should know:
    1) the front drivers side drive shaft is out of the truck (broken), still have to replace that, but i can't see how this could have a bearing on this problem???? Maybe?
    2)This problem showed itself two times just before i yanked the T-fer case and replaced the fork......I guess i'm just confirming that it is probably not the t-fer case that i just took apart and put back together.
    3) 2006 H3, inline 5, adventure package.

    Any help would be greatly appreciated.

  2. #2
    El Diablo
    Join Date
    Sep 2011
    Location
    Scottsdale
    Posts
    9,195
    Thanks
    637
    Thanked 3,338 Times in 1,659 Posts
    With the front driveshaft removed you MUST drive in 4 high lock to get the truck to move. It will not work in regular 4WD mode. In other words, the truck is acting normally, nothing is wrong. Once you put a new front driveshaft in the transfer case will operate normally, assuming no other issues in the driveline.

  3. #3
    Bald Tire
    Join Date
    Oct 2019
    Location
    White Mtns, AZ
    Posts
    5
    Thanks
    0
    Thanked 0 Times in 0 Posts
    Hey Alrock, thanks for the info. That was one of my guess's.
    SO are you saying the normal driver wheel for the truck in AWD is the front left (driver side) tire? that just didn't just make sense to me that's why i originally ruled it out.

  4. #4
    El Diablo
    Join Date
    Sep 2011
    Location
    Scottsdale
    Posts
    9,195
    Thanks
    637
    Thanked 3,338 Times in 1,659 Posts
    Not sure what you mean. If you're in normal 4wd Hi unlocked mode (left button) and there's no resistance in the front end (missing prop shaft, broken diff, or broken/missing CV axles) then it's like an open diff (see My Cousin Vinny for a detailed example) and all the power from the transfer case goes to the path of least resistance, i.e. the front output of the transfer case and the rear gets none. Your H3 won't move under its own power. In this particular example, it's not about right or left (like in an open diff) but front to rear.

    If the transfer case is locked, like it is in 4WD Hi lock (middle button) and 4WD low (right button), then the power is routed equally to the front and rear.

  5. #5
    Street Tire
    Join Date
    May 2018
    Location
    Alabama
    Posts
    206
    Thanks
    9
    Thanked 32 Times in 31 Posts
    Love the My Cousin Vinny reference.


    Sent from my iPhone using Tapatalk

  6. #6
    Street Tire
    Join Date
    Jun 2015
    Location
    SoCal
    Posts
    295
    Thanks
    2
    Thanked 64 Times in 49 Posts
    Yup, as Alrock said, when in 4HI (unlock), the transfer case is an open diff, and will send power to the side (end, front or rear) with the least resistance. No front driveshaft means THAT is the end that gets all the power. Shifting to 4HI Lock locks that "center diff" and forces power to both ends; front and rear.
    We don't stop playing because we grow old... We grow old because we stop playing.

  7. #7
    Mr. Beretta
    Join Date
    Sep 2011
    Location
    Who cares!
    Posts
    1,940
    Thanks
    8
    Thanked 602 Times in 368 Posts
    The open differential allows the wheels to turn at different rates of speed while the axle continues to transmit the driving force. This prevents tire scuffing when going around corners and premature wear on internal axle parts.

    But all info so far is good and simple on how the operation of the BW t/case works.

    And no I am not cousin Vinny. I'm the SOB in the north who is taking a break from rebuilding a carburetor on my frigging snowblower; and happened upon this site, while trying to warm up.

    Don't know anything about Hummers, but I do speak Malamute.

  8. #8
    Bald Tire
    Join Date
    Oct 2019
    Location
    White Mtns, AZ
    Posts
    5
    Thanks
    0
    Thanked 0 Times in 0 Posts
    thanks for the feedback, totally made sense. New cv joint/ drive shaft going in today.


 

Similar Threads

  1. H3 Disengage transfer case to Neutral for towing Behind Motor Coach
    By ReRun0007 in forum HUMMER H3 2006-2010; H3T 2009-2010
    Replies: 5
    Last Post: 05-03-2018, 08:20 PM
  2. Neutral light
    By woflie in forum HUMMER H2 2003-2009
    Replies: 8
    Last Post: 06-15-2015, 10:07 PM
  3. 4x4 NEUTRAL Light Coming On
    By ADOR in forum HUMMER H2 2003-2009
    Replies: 11
    Last Post: 09-05-2014, 07:22 PM
  4. Sound system?
    By rsm688 in forum HUMMER H3 2006-2010; H3T 2009-2010
    Replies: 5
    Last Post: 07-31-2014, 09:51 PM

Bookmarks

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Logout