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  1. #1

    Default front Differential

    Hi All ,
    I'm new to the forum . I joined in hopes of helping others and receiving help as well .
    I'm a caterpillar mechanic but try to work on my own vehicles as well .
    I have recently bought a 2007 2500hd 6l gas 210000kms
    I drove onto the lake yesterday and got stuck min the snow . I had switched to 4wd high before going onto the lake . I heard a small clunk just before getting stuck .
    I washed my truck today and raised it off the ground , front end only .
    Switch posistion 2wd .
    I turned each front wheel and noticed that the axles turn as well on both sides .
    I posistioned the switch to 4wd high and heard engagement of the transfer case . I went under the truck and the drive shaft doesn't turn , normal as the rear wheels are still on the ground . I can still turn both the front wheels by hand .
    I drained the oil and found no debris or cuttings just some fuzz on the magnetic plug .
    I removed the front skid plate and noticed that there is a solenoid on the front differential .
    How and when does this solenoid work ? Could this just be an electrical issue ? The dash switch indicates all posistions 2wd , 4wd and 4wd low when selected . But there is no drive to the front wheels ?
    Can anyone help here
    Thank you in advance .

  2. #2


    That is your center axle disconnect (CAD). In 2H, it disengages the front axles from the front driveshaft. In 4H/4L, it locks them together. If you aren't getting any drive to the front end, this is a likely candidate. Could be electrical or could be mechanical -- I'm not real familiar with the operation of the CAD. I'd probably start with a little research and then probably start by checking the electrical (because it's probably easier to probe the wires than take the thing apart).
    '98 K1500 Suburban LS 5.7 L 4L60E NV246 ARB
    '92 Ford Explorer XLT 4x4 4.0 L A4LD BW13-54 Trac-loc rear
    "My toys were the greasy cogs and springs and pistons that lay around all over the place, and these, I can promise you, were far more fun to play with than most of the plastic rubbish children are given nowadays." Danny in Roald Dahl's Danny The Champion of the World

  3. #3
    Eddie Z71's Avatar
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    Mar 2009
    Colorado Springs, CO
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    Hi, and welcome to the site! Hope you find the problem, and it is a easy fix. Good luck!
    Eddie , 2000 Chevy Tahoe Z71 (old style)

  4. #4


    Welcome to the site!

    Bobby - North Carolina
    2008 4x4 5.3L V8
    6" Suspension Lift and 1.5" Body Lift
    20x9 Ballistic Jesters w/35" Toyo Open Country MT's & 1.5" rear wheel spacers
    4:56 Yukon Gears
    Hypertech Speedometer Calibrator
    Baja style bed mount spare tire carrier
    Flowmaster 40 series dual exhaust
    Recon Smoked LED tails/3rd brake lights/black projectors w/switchback LED's in the corners
    N-Fab Nerf Steps
    K&N CAI
    No Fear Pedals
    Tint, Line-X bedliner, Window visors, Rear wheel well liners
    Painted front grill, bow ties and door badges, de-"lettered" tailgate
    Powder coated front and rear bumpers

  5. #5


    Thank you very much . I can now research the cad .
    Your right , I didn't want to start ripping things apart as that is a waste of time and money .
    I was happy not to see chunks in the oil , this info makes me feel even better , thanks again Mr Shorty
    Update Jan4/10
    I removed the disconnect actuator and switched to 4wd and the plunger of the actuator comes out like it should .
    I tried to use a screwdriver to push the internal part that would normally be moved by the actuator and no luck . So I now have to open things up . I'll keep you all posted .
    Jan 4 evening
    Hi All
    Well ,thats done ! I separated the axle and moved it away from the diff housing drive end ( right hand side ) . Removed the end housing that contains the disconnect and a bunch of debris , gear chunks and pieces of the engaging yoke . Cleaned all that out and bought new stuff at the ex GM dealer in town here as they had all I needed . The yoke and the gear , oil and sealant to reconnect .
    I asked my daughter to give me a hand which she was happy to do . three hours and we were test driving it , OK so far . All the parts incl. oils and sealant were $ 260.00 Can. Good deal as the shop rates these days are , well , wow, way too much .
    Nice that the diff and disconnect are somewhat seperate comparments . Saves on migration of the contaminents destroying the diff too .
    Take care all , hopefully I can be of assistance sometime !
    Last edited by jacobus; 01-04-2010 at 06:48 PM. Reason: update

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