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Thread: Need help with tranny or transfer case issues please

  1. #1
    Corporal
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    Default Need help with tranny or transfer case issues please

    Hi Guys,

    Need some input on a problem I'm having with my '95 M998, 6.5 w/3L80e Trans.

    Shifting into drive with the t-case in H, the truck acts like the E brake is on, takes a lot of pedal to get it to move. Jacked up the front and rears to see if the brakes were dragging, all wheels spin freely with no noises. Gave each half shaft a good look and tug to see if they were broken, all good.

    Changed tranny fluid and filter, replaced fluid with Dex III. Still same results.

    If I put the transfer case in HL it moves a little better, but still real sluggish.

    Could use a few clues on where to look now if anyone cares to jump in.

    Thanks

    Chris
    If at first you don't succeed, destroy all evidence that you tried...

  2. #2
    3 Star General
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    Curious. I don't have an answer, other than complete spitballing. But I'm interested to hear what comes of this thread.
    I guess I'll offer the idea to check your linkage for the transfer case shifter. Investigate inside the boot for foreign objects and check that the connections/controls between the shifter and the TCase are not being interfered with or loose.

    I had an old Jeep that was sluggish and complained about shifting into 4WD. My theory was that it had been driven too long without using the 4WD gears of the transfer case. Doesn't seem likely to be your issue.

    BDGR

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    Does the engine seem like it's under load before you start moving? If so you might have something seizing up in the drivetrain.


    Mike

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    I hope while your in High Lock (HL) the
    truck is on a “forgiving” surface.
    M35a3 with 53" tires, love them

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    Sue raises an interesting point. Have you used Lock often and if so did you perform the 50’ reversing maneuver to relieve drivetrain tension? Seems like a simple thing, but it makes a difference.
    Bulldogger

  6. #6
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    Quote Originally Posted by sue View Post
    I hope while your in High Lock (HL) the
    truck is on a “forgiving” surface.
    Just straight forward and backward 30 ft in my gravel drive
    If at first you don't succeed, destroy all evidence that you tried...

  7. #7
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    Quote Originally Posted by Bulldogger View Post
    Sue raises an interesting point. Have you used Lock often and if so did you perform the 50’ reversing maneuver to relieve drivetrain tension? Seems like a simple thing, but it makes a difference.
    Bulldogger
    New to me truck - Bought it about a year ago, just finally getting a chance to mess with it.

    Chris
    If at first you don't succeed, destroy all evidence that you tried...

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    Try finding a place to back up 150’ to be sure the differentials are stress relieved. They could be bound up.
    I’ll Bulldogger

  9. #9
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    Quote Originally Posted by Bulldogger View Post
    Try finding a place to back up 150’ to be sure the differentials are stress relieved. They could be bound up.
    I’ll Bulldogger
    Jacked up one end at a time and free spun the wheels to ensure the brakes weren't dragging. Should have released any windup.

    This isn't my first HMMWV - Just the first one I can't figure out....

    Thanks for the suggestion though, keep them comming. I'll figure it out sooner or later.

    Chris
    If at first you don't succeed, destroy all evidence that you tried...

  10. #10
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    If you happen to end up needing a low mileage transfer case I have one to sell.

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