rear u-joint

Discussion in 'Transmission and Drivetrain Tech' started by Dave NEO, Jun 4, 2018.

  1. Dave NEO

    Dave NEO Well-Known Member

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    I just noticed has an empty hole where it looks like a grease fitting might go (inside the body vs. in an end). Maybe a dumb question but is there any way this should be an empty hole? got some vibration in what seems to be clutch T.O. but am looking around for other causes..thnx '68 383 Barracuda 4spd.
     
  2. Alaskan_TA

    Alaskan_TA Well-Known Member

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    Sounds like the zerk popped out or someone did not think to install it.

    If if has a bunch of miles on it a fair amount of grease may me gone by now.
     
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    • Dave NEO

      Dave NEO Well-Known Member

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      great. I will at least try to put one in and grease it..hopefully not too much junk inside there..
       
    • pishta

      pishta I know I'm right....

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      they usually come loose in the box, maybe missed it when it was installed.
       
    • Alaskan_TA

      Alaskan_TA Well-Known Member

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      With the vibration in mind.......

      Get it up in the air & safely supported first, before greasing.

      With the transmission in neutral & one hand on the driveline & the other on the yoke holding it tight, twist the driveline back & forth & look for any play.

      Front joint too.
       
    • Dave NEO

      Dave NEO Well-Known Member

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      put one in and grease it. No excessive play in either front or rear joints. It seems to chatter a littlel less but still there. Will try to remove inspection plate ans look for anything obvious..thanks for your suggestions/comments.
       
    • Alaskan_TA

      Alaskan_TA Well-Known Member

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      If there is any play at all you should replace them.
       
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      • Dave NEO

        Dave NEO Well-Known Member

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        just to be clear - no play in joints at all - I could move yoke a bit in/out of differential. ok, also, I removed inspection cover on clutch - I could wiggle the TO bearing a bit - how much should this move? Did not note any grease/oil on anything I could see into. Saw a few tiny shiny/metallic specs inside the housing - clutch material or maybe from the bearing?
         
      • 70dustah

        70dustah Well-Known Member

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        If you are experiencing a vibration, and you found the u-joint grease fitting is missing, it would be best to remove the driveshaft and check both u-joints for binding during movement before installing a new grease fitting. I have seen plenty of them show no signs of in/out, up/dn play, yet binding during operation. A not so time consuming operation for piece of mind chasing the vibration down, and ruling the u-joints as a cause
         
      • Dave NEO

        Dave NEO Well-Known Member

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        I hear you, thanks - no, it's not that kind of vibration - more of a clutch related noise I can get w/o driveshaft spinning. thanks for input/ideas.. I need to find out how TO bearing should move/feel on shaft. Next will be sourcing a step by step TO bearing replacement vid or write-up to see if this is something I might tackle myself.
         
      • Sterling

        Sterling Well-Known Member

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        The yoke should not move in and out of the differential, which differential do you have ?
         
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        • Dave NEO

          Dave NEO Well-Known Member

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          Transmission: rebuilt 18 spline Hemi A833 4 speed.

          Sure Grip 489 8 ¾ housing, 3.23 gears.
           
        • Daves69

          Daves69 Well-Known Member

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          So this is noise/vibration only while depressing the clutch pedal and engaging the plate fingers?


          IMO, Wear may be a little tough to see without actually opening it up. You could pull the four bolts, visual inspect the two that are open and "feel" the swivel of the two still in the driveshaft.

          upload_2018-6-13_9-36-25.png
           
        • TrailBeast

          TrailBeast Slightly Twisted Member

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          I noticed that as well.
          That's not good at all.
           
        • Dave NEO

          Dave NEO Well-Known Member

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          I will double check that yoke movement..otherwise others seem to say TO bearing - how much should TO move on the shaft? Seemed to wiggle a bit when I grabbed it when I had the insp. cover off.
           
        • Dave NEO

          Dave NEO Well-Known Member

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          yes
           
        • TrailBeast

          TrailBeast Slightly Twisted Member

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          How much does your crankshaft move forward and back?
          Everything I'm reading here suggests TO bearing or crank thrust bearing.

          TO bearings that are not hydraulic can move forward and back up to 1/4 or so.
          There should be pretty much zero side to side or twist.
           
        • Dave NEO

          Dave NEO Well-Known Member

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          ok thnks - yes besides sliding a bit front to back it also moves as though it is not tight on the shaft..so whatever that is saying.
           
        • Sterling

          Sterling Well-Known Member

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          With a 489 housing, if the yoke moves forward and back, the pinion nut is loose, pinion bearings are bad, or a problem with the collapsible spacer. If you have noise with the clutch pedal depressed, that is probably the throw out bearing. Bearing retainer on the front of the transmission could be worn or broken
           
        • Dave NEO

          Dave NEO Well-Known Member

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          thanks much, will check.
           
        • Dave NEO

          Dave NEO Well-Known Member

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          I added some clamps to rear leaf springs- besides stiffening spring action I think it raised ride height in rear slightly - any way this could cause an issue with noise in driveline/clutch action? just thinking out loud here for anything that changed before I started hearing clutch noise..
           
          Last edited: Jul 2, 2018
        • oldkimmer

          oldkimmer Well-Known Member

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          If the vibe seems better after u greased the rear joint wouldn’t u think that u maybe have a problem there? Just saying. Kim
           
        • Sterling

          Sterling Well-Known Member

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          I have found spring clamps on the front segment of the leaf spring bind up on the frame. Easy enough to unbolt them and try it