What is a transmission tailshaft bushing?

Discussion in 'General Motoring' started by pasdf00099999, Sep 15, 2005.

  1. I've been told I need to replace my transmission tailshaft bushing on
    my '89 240, and have been quoted ~$250 to do so. What is this? Thanks a
    lot.

    Bill
     
    pasdf00099999, Sep 15, 2005
    #1
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  2. pasdf00099999

    WJ Guest

    Well, your transmission has a shaft coming out it's...tail, and it has to
    rotate on some kind of bushing or bearing. By what you've been told, I'll
    assume its a bushing this time (dang, I'm brilliant <g>). If that bushing
    gets worn, there will be slop in the shaft, which could cause strange
    shuddering (especially on acceleration), ominous howling at any speed,
    clunks, bumps and/or whines, and possible fluid leakage (assuming the
    accompanying seal is as worn as the bushing). If your mechanic is
    trustworthy, I'd go ahead and have the work done. You don't want to let
    something like this go too long, or it will begin to damage much more
    expensive parts.

    If you're interested in confirming the problem, you can easily do the same
    thing that the mechanic surely did to diagnose it in the first place. Put
    the front of the car up on ramps, put the transmission in neutral, and set
    the E-brake good and tight. For good measure, block the back wheels. Slide
    under the car, and look for the drive shaft. It's a steel pipe about 2 1/2"
    across, running right down the middle of the car, from the transmission to
    the rear axle. If the car is warm, beware of the exhaust pipe; it will be
    HOT. Don't mistake the exhaust pipe (which has bends in it, and is probably
    rust colored) for the driveshaft (which is painted black). Grab the drive
    shaft right before it reaches the transmission, and shake it. If it feels
    loose or clunks, your mechanic is right.

    Another problem that can have similar symptoms is a worn or broken
    transmission mount. If when you jiggle the driveshaft the whole
    transmission moves a lot (but the driveshaft and the transmission feel tight
    to each other), then that's probably the problem. However, any mechanic
    worth a bean would immediately be able to tell the difference between the
    two. Of course, you might have both problems, in which case you'll get both
    kinds of movement. Worn tranny mounts are fairly common on older cars. Ask
    your mechanic about replacing it while he's down there. He'll be able to
    tell you if it needs doing. Tranny mounts for the 240 are dirt cheap, and
    it won't take him that much longer to do the work.

    Cheers,
    Walt
     
    WJ, Sep 15, 2005
    #2
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  3. pasdf00099999

    James Sweet Guest

    It's the bearing at the back end of the tranny where the driveshaft
    attaches. The part is around $35 if you've got some tools, not a bad DIY job
    if you don't mind working on cars. If it gets too bad the seal will fail and
    the fluid will leak badly.
     
    James Sweet, Sep 15, 2005
    #3
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