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Gears not as smooth after greasing Uni-joints and slip yokes

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  • Gears not as smooth after greasing Uni-joints and slip yokes

    Continuing my home servicing mission of my auto 2012 150 3l it was time to grease the tailshaft.
    Being my first time I did what I thought was sufficient research so I couldn't stuff it up. Over filling the slip yoke seemed the only risk!

    I greased the Uni-joints until I saw the new grease ooze out. I now understand I should have stopped as soon as I saw the old grease appear. Still no real harm done I believe.

    The slip yoke I greased twice. First I just put in 3 squirts from my mini grease gun. Went for a test drive and immediately noticed the low gear changes weren't as smooth and I was still experiencing a good tail shaft whack.

    So I greased both slip yokes until I saw movement in the prop shaft, removed the zerk and rocked the car back and forth, even backed up and forth and slammed brakes. A nice long 6cm bead of grease squeezed out. Replaced zerk.

    Problems I'm now experiencing:

    1. After pulling off from a stop the 2nd gear change feels significantly more abrupt.

    2. Coming to a stop that last gear change before stopping is more noticeable.

    3. At a stop the whole car seems to vibrate more at idle even in neutral. Once it D or R the vibration is worse

    There is noticeably more over all vibration when under load compared to coasting. Vibration under load seems less noticeable the faster you go.

    The engine did already excessively shake as the mounts are probably shot but this far more noticeable vibration only started immediately after greasing the the drive train.

    Please could anyone with further knowledge help explain what could be the cause and possible solution?

    To add.

    Yesterday I removed both the front and rear slip yokes to inspect them. Nothing looked suspicious, splines perfect. The only difference I noticed was the front yoke glided in and out smoothly. With the rear yoke there was resistance at a certain point and it didn't slide smoothly. Even greased up there was still resistance at one certain point when sliding it back together. Could this contribute to the more jerky changes?
    Last edited by Pilotg2; 10-05-2021, 10:07 AM.
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