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  1. #1

    Default NV246 fluid recommendation [Expired Topic]

    I've been slowly working through changing some of the fluids on my recently acquired '98 Suburban, and got to the transfer case.
    Now, I had noticed that, in A4WD mode, it would chatter and such in sharp turns (like in a parking lot. Don't you just love maneuvering a Suburban in a parking lot).
    Even though the owner's manual said to use DexIII in the transfer case, I had heard rumors that the NV246 required a special fluid. So I researched it out and, sure enough, GM sells a blue "Autotrak II" fluid specifically designed for their automatic 4WD equipped transfer cases, including the NV246. So I bought some (@ ~$8+tax per quart) and went to change the fluid.
    Went to pull the fill plug and discovered that GM had installed an odd sized fill plug, so none of my existing adaptors would fit. Ended up grinding down a 3/8 in male socket adaptor to ~5/16" (officially 0.307 in square) and that fit just right in the fill plug. Pulled the fill plug and, sure enough, red fluid came dribbling out. Pulled the drain plug (regular 1/4" drive) and got the Dex III out. Refilled with the blue stuff and took it for a test drive. No more chattering in A4WD.
    '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

  2. #2

    Default RE: NV246 fluid recommendation

    Good catch, glad it worked for you.

    It is not unusual for GM and all the others to change lubricants.

    My 85 IROC had a couple of recalls, first was a head gasket.

    Then they changed the rear axel fluid to whale oil.

    Technology is great, when it Works,
    And one Big Pain in the Ass When it Doesn’t.
    Detroit Iron Rules, All the Rest are Just Toys.
    94 GMC Burban, 5.7L (350), 4X4, Auto
    86 GMC Burban, 350, 2 WD, Auto
    79 GMC pickup plow truck, 400, Full time 4X4, Auto
    86 Pontiac Fiero SE, 2.8L, Auto, only mid engine American car
    See a Pattern yet?

    15 year GM assembly line worker.

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