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another name that sound

Discussion in '40- & 55-Series Tech' started by rgentry, Jan 31, 2003.

  1. rgentry

    rgentry

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    OK. I stole the title from a previous post. Here
    is my sound:

    On acceleration, I get a driveline "tap" that sounds
    like it is coming from the rear. If I decelerate and
    mildly speed back up, I can hear it. It only happens
    once. On takeoff, let off the clutch and tap, just once.
    If I am real smooth, no tap.

    U-joints appear OK. &nbsp:Driveshaft bolts tight. Pinion
    has no slop and only about 5 degrees of radial
    play. If I rotate the driveshaft back and forth
    while I am under the cruiser, I think I can hear
    the noise coming from the 3rd member. Is this
    tap the slap of the ring hitting the pinion?
    Could it be wear between the pinion spacer and
    the rod that travels through it? Should I go
    to the trouble of pulling the differential cover
    to take a look?

    Oh yea. My driveshaft is out of phase because
    some careless mechanic left it that way about
    two months ago and I have not fixed it. I
    don't think that this is contributing to the
    problem.
     
  2. woody

    woody Internet Fireman Staff Member

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    It may not be the problem, but it's 4 bolts and 15 minutes to fix that slip yoke issue, and until you've eliminated that, the problem may continue.

    How are the d-shaft splines? Out of phase d-shafts will speed wear greatly.

    Does it go away after braking ie: pads seating/shoe springs no longer hitting...etc...
     
  3. rgentry

    rgentry

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    Hey Woody:

    It may not have explained myself. It does not "go
    away" as it only happens once in a given acceleration-
    deceleration cycle; it's like some slack in the
    drivetrain is taken up and the tap won't happen
    again until I take the torque off the drive train.
    Does this make any sense at all? I will put the
    driveshaft back right this weekend. I am damn sure
    pissed at the mechanic who left it that way. I would
    name names but that's not my style. How should
    I check for wear in the driveshaft splines?
     
  4. IDave

    IDave

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    What you describe sure sounds like a worn u-joint to me: it is a familiar sound. Probably could be other things, too. Just my thought.
     
  5. rgentry

    rgentry

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    Post script:

    This weekend I took my driveshaft out. Both U-joints
    were fine. I put the driveshaft back into phase and
    re-greased the splines. I reinstalled the driveshaft
    and added about 1 pint of oil to the differential. The
    tap has dissappeared. If I had to guess, I would say
    that the bolts were a bit loose and that the tap
    I was hearing was the driveshaft moving on the
    transfer case output shaft at the parking brake.

    Some mechanic has replaced my driveshaft to pinion
    bolts with home depot grade stuff, claiming that the
    correct bolts are no longer available from Toyota.
    Ack.
     
  6. woody

    woody Internet Fireman Staff Member

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    glad you got it fixed...those little noises can be a PITA for sure!!