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  1. #1

    Default Transfer case dilemma - Temporary fix

    I recently put a 5 speed standard in my truck. The donor truck was undrivable so I was never fully aware of the functionality of the setup I was getting, but I took a chance. Anyways, the oil was nice and clean in both tranny and transfer case and the Tcase appeared to have been freshly rebuilt, so I bolted the setup in and threw new oil in both.

    Now, the setup works fine but with one fairly large dilemma. When I run in 2H, the transfer case will occasionally grind like when you force something into gear, and sometimes it will drop out into neutral. The Tcase will run perfectly fine in both 4L and 4H, however. As a temporary remedy, I have been running in 4H with no front drive shaft.

    Here's the situation:
    I need the truck to have working 4x4 so I can get out in the field, but I cannot afford to send it to a shop right now and I won't have the time to drop the Tcase myself for another two weeks. This is my ONLY truck at the moment.

    So I was wondering, what sort of trouble would I be getting in to if I manually engaged and disengaged the front axle solenoid via switch, and just ran the TCase in 4H all the time? The front drive-shaft would always be spinning, but with the open differential it shouldn't be under much load, and I can then engage 4x4 via the solenoid that locks the axleshaft. ( My mind tells me it should work and it shouldn't put too much stress on things )

    This would only be temporary.

    ( TCase is NP241, tranny is NV4500, truck is a half ton with 3/4 ton axles. )

  2. #2


    Well, you'll get rotten gas mileage, and it's not a good idea to drive too fast. Stick to residential streets.

  3. #3


    I get rotten mileage anyways. ;)

  4. #4
    Sr. Mechanic ChevyHD's Avatar
    Join Date
    Jan 2011
    Elberon, Iowa, United States


    lol definitely keep out of the skinny pedal
    2004.5 CCSB Duramax
    Max Effort Tuning by Idaho Rob - Goerend Transmission - PCV ReRoute - EGR Blocked - Plugged Resonator - 5" Diamond Eye Turbo Back - Tie Rod Sleeves - All On Mod - Edge Insight CTS - Recon Taillights, Cab Lights, & 3rd Brake Light

  5. #5


    Add some Duralube Trans treatment into the diff and case to reduce heat. It should wear much smoother.
    Brian L.

    Brian Larson CST. KC9DAK.
    Janesville WI.
    87 GMC G20 6.2 diesel.

  6. #6


    I had the same issue multiple times with my 95. It would grind on acceleration in 2wd, was fine in 4x4. It turned out that there is a c clip in the transfercase that was popping off of a shaft. The dealer repaired it under warranty 4 times. The same thing happened to my sisters 98 Tahoe. Same clip issue. I think that it took them about an hour to fix it. I wish that I could give you more details, but I have never actually been inside one of the t cases.

    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,
    2002 Silverado ext cab 2wd (Sold)
    2003 Yukon XL (Totaled)

  7. #7


    Actually, I've heard of this issue before, but it never occurred to me that it may be the cause of my troubles

    Found this:
    And a few sites saying that it is a common problem.

    When I change my U-Joint I'll slide the housing off and look.


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