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  1. #1
    Master Mechanic
    KyleZ71's Avatar
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    Default Transmission or transfer case problem

    Hey guys sorry its been so long but I was busy trying to graduate college and get my air force commission.

    The other day after leaving a local air race the truck had problems accelerating. I thought I lost overdrive but saw in the message box "service 4wd". I looked over an saw that the truck had somehow put itself in 4wd low. I did not have the truck in neutral nor did I hit or numb 4wd low. After I pulled over and put the truck into 4wd high, then 2wd I heard a low metallic bang. Now when I'm driving the t truck, as I accelerate I hear a pop when shifting and sometimes a rattle as well. I'm now wondering if the damage has been done to the transfer case or the transmission itself?
    Objects in mirror are losing

    2003 Chevy Silverado Z71, 5.3L, K&N 57 series, 2.5'' Flowmaster Super 10 series dual exhaust , Corvette Servo, McNew Automotive Dyno tune, SS gauge cluster, Extang Trifecta Tonneau, Pacesetter shorty headers, Goodmark cowl hood, Sony Xplod speakers, Kenwood DDX-470 exhaust tips, 16" Ultra Badlands polished wheels, Pirelli Scorpion ATR .

  2. #2

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    i would have to guess t-case. I have see exactly what you described and it turned out to be a bad tcase. Except the one I saw kept going into 4 low.

    if your tcase has never been rebuilt or replaced the I believe that your model falls under the years and model that had the pump rub issue. see if there is even any fluid in it.

    about 1:20 in the vid shows where to look for the hole. It ca be really small and will only leak when driving.
    Last edited by Pikey; 06-19-2014 at 08:08 AM.

    1995 Silverado 4x4
    6" BDS Suspension Lift-3" Body Lift-Add A Leaf in rear -Trailmaster SSV Shocks-Duel Steering Stabilizer Kit -AirAid Cold air intake-
    4.56 Gears with Detroit Auburn Locker-Pro-Comp Traction Bars with duel shocks-Aluminum Skid Plate Kit-38.5" x 16.5" Mickey Thompson Baja Claws-Constant Dropping fuel gauge

    2005 Yukon XL Jet Power Programmer, Bilstein Shocks, Bilstein rear springs, Helwig Anti-sway bars, EGR Window Visors, EGR Hood Shield, Denali Headlights, Headlight harness upgrade, GE NightHawk Bulbs, White Night Rear lighting system, Russell Braided SS brake lines, PowerStop Brake pads, PowerStop cross drilled and Slotted Rotors, http://www.gmtruckclub.com/forum/sho...5-GMC-Yukon-XL
    2002 Silverado ext cab 2wd (Sold)
    2003 Yukon XL (Totaled)

  3. #3

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    I think the best thing to do is change the T-case fluid and maybe also the rear and front diff fluid so you can check the old oils for any metal shards/chips. Also will allow you to smell if anything is burnt in there. For the rear diff while you have the cover off put one of the wheels in the air and turn until you can see the internals of the carrier to make sure they are ok(I don't think i need to tell you about how to do that right). I would also check on how the front shaft spins because it should move very smoothly as well as check the rear shaft for any play in any direction.

    1996 Chevy Tahoe LT 5.7L V8 4X4 205,000+ miles. Built proudly at Janesville Assembly in Janesville, Wisconsin
    Basic mods: Lights all over, bunch of electrical work, and a couple cooling mods.

    Check out my other mods in My Garage: http://www.gmtruckclub.com/forum/sho...t-Tahoe-4-Door

  4. #4
    Master Mechanic
    KyleZ71's Avatar
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    Default

    Was gonna change the transfer case fluid just to check (even though I changed it in February). Will be kissed if the transfer case needs replaced as it was replaced last june

  5. #5

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    Quote Originally Posted by KyleZ71 View Post
    Was gonna change the transfer case fluid just to check (even though I changed it in February). Will be kissed if the transfer case needs replaced as it was replaced last june
    was it a rebuilt case? where did you get it? if rebuilt then the pump rub issue should have been resolved. If you got it from GM it has a 3 year 100,000 mile warranty. You can just take it to a dealer and they have to remove and repair it.

  6. #6
    Master Mechanic
    KyleZ71's Avatar
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    Default

    Was a junk yard tcase with low milage. Should've bought a rebuilt

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