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  1. #1

    Question 2004 Suburban 4WD problems

    Not to long ago we aquired this great truck. The front diff. was wet and the axle seals were leaking. We choose to do a quick change out of the diff. & went ahead and obtianed a good used one and changed it out. With in a few days the new diff began to show the same visual wetness (in just 2WD)
    Because I do not know how this 4x4 system (auto) works, I wonder what be the cause?
    I have check the vent tube and it is clear?
    I have driven it at Hwy speed in auto 4WD and it looks worse.

    Anyone who knows the issue and can help, please communicate as I really enjoy the truck.

    Thanks to the two who replied thusfar.
    If anyone reading this knows how the 4x4 sytem (c/w auto 4x4 switch) works with this truck & that might have an idea or two on this problem. Please feel free to reply, as any help will be greatly appreicated.

    Rumor has it that there are clutches in the transfer case. Could this may be the issue?
    Last edited by Caper; 01-13-2013 at 04:05 PM.

  2. #2


    Welcome to the club, I don't put used parts on my truck for that reason and I suspect you should just install new seals. I am sure someone will weigh in soon that knows that system. Good luck.

    2002 Chevrolet Silverado Extended Cab SportSide: See Mods in My Garage

  3. #3
    Sr. Engineer
    Join Date
    Feb 2012
    Western Maryland/Wyoming


    Welcome to The Club. I agree with donyms.

  4. #4
    Jr. Engineer Jamm3r's Avatar
    Join Date
    Dec 2012
    Minneapolis area


    It is not unusual for the pinion seals to leak in trucks of this vintage. Mine does though not badly (front). I resealed the transfer case, which was leaking, when I had it out, and have replaced not only the seals but the yoke on the rear axle to resolve leaks.
    Minneapolis area - 1997 K2500 regular cab long bed + 8.5' Western Unimount plow + modified transmission + 2nd battery + modified camper charge circuit + 1971 Cayo camper -and- 2004 4x4 Suburban 2500 8.1 + Maxbrake controller + 2nd battery + modified trailer charge circuit + Reese receiver, pulls 30' Airstream trailer

  5. #5

  6. #6



  7. #7


    Welcome to the G M T C ! I put 149,000+ miles on my '04 w/o any problems, so I can't help.

    2010 Z/71 Colorado C/C
    Black 4X4 w/5.3L V8
    2007 Winnebago Adventurer
    w/8.1L Chevy & Allison 6spd.
    Canyon Lake, Texas

  8. #8

    mfleetwood's Avatar
    Join Date
    Jul 2010
    Denver, CO
    Blog Entries


    Welcome to the Club!!!

    I moved your thread here as it will help in getting you more responses geared toward your topic vs the Member Intro section. Sorry I can't be any help otherwise.

    Good luck and I hope you find/fix your problem soon.

    Mike (Denver, CO) - 2008 Sierra 1500 Z71 SLE 5.3L 4WD

    SUSPENSION: Rancho 4" Suspension Lift; Rancho RS9000XL Shocks; Rancho Skid Plates; Rancho MyRide Wireless Shock Controller;
    BFG All Terrain KO 315/70/17
    DRIVE TRAIN: 4.56 Gears; Detroit TrueTrac Differential; True Cool 40k Transmission Cooler
    PERFORMANCE: DiableSport Predator Tuner; Custom Tuned by Diablew; Magnaflow Exhaust; AFE Cold Air Intake
    ELECTRONICS: Kenwood DNX6180 Touchscreen; Subthump box w/10" Kicker; Driver Information Center (DIC); Rear View Camera
    ACCESSORIES: Westin Brush/Grill Gaurd; Westin Nerf Bars; Truxedo Tonneau; 20% Tint; Tow Mirrors w/Heat & Signals

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