driveshaft install problems with body off - NCRS Discussion Boards

driveshaft install problems with body off

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • Domenic T.
    Expired
    • January 29, 2010
    • 2452

    #16
    Re: driveshaft install problems with body off

    One of the Munci transmissions I rebuilt was sold to a customer and when I installed it the drive shaft didn't fit! I was the one who took the old trans out and was attempting to install the rebuilt. The slip joint went in to the marks that the seal made on it, BUT, that was as far as it went!
    All looked good, but slip joint would not slide in enough to install drive shaft.
    I removed the tail housing to see if there was something stopping the slip yoke from going all the way in, and all looked good. THEN I saw what looked like a slight twist in the splines. The main shaft had twisted splines. I got another off the shelf and bingo all worked just fine.
    What I am trying to point out is make sure the old and the new slip joint slip in enough to install the drive shaft, because there are twisted (almost un detectable) flaws caused by mega HP and slicks that can twist a shaft.
    If that's the only thing changed then make sure the slip joint slips ALL the way in the trans for drive shaft installation.

    Dom

    Comment

    • Larry M.
      Extremely Frequent Poster
      • January 1, 1992
      • 2688

      #17
      Re: driveshaft install problems with body off

      Originally posted by Domenic Tallarita (51287)
      One of the Munci transmissions I rebuilt was sold to a customer and when I installed it the drive shaft didn't fit! I was the one who took the old trans out and was attempting to install the rebuilt. The slip joint went in to the marks that the seal made on it, BUT, that was as far as it went!
      All looked good, but slip joint would not slide in enough to install drive shaft.
      I removed the tail housing to see if there was something stopping the slip yoke from going all the way in, and all looked good. THEN I saw what looked like a slight twist in the splines. The main shaft had twisted splines. I got another off the shelf and bingo all worked just fine.
      What I am trying to point out is make sure the old and the new slip joint slip in enough to install the drive shaft, because there are twisted (almost un detectable) flaws caused by mega HP and slicks that can twist a shaft.
      If that's the only thing changed then make sure the slip joint slips ALL the way in the trans for drive shaft installation.

      Dom
      I like how you think...............

      See my post #16.

      Larry

      Comment

      • Domenic T.
        Expired
        • January 29, 2010
        • 2452

        #18
        Re: driveshaft install problems with body off

        Originally posted by Larry Mulder (20401)
        I like how you think...............

        See my post #16.

        Larry
        Larry,
        You type faster than me, LOL. Amazing, you found that also in a main shaft. here I was thinking I was the only one to think of that!
        Can't wait to see if that's what it is.
        Your friend,
        Dom

        Comment

        • Sascha P.
          Expired
          • April 7, 2019
          • 43

          #19
          Re: driveshaft install problems with body off

          I rebuilt the transmission. New gears, new mainshaft, new yoke. The new mainshaft has straight splines. Just now I went back into the garage and played with the olds mainshaft and the new/ old yokes. Turns out the new yoke has some kind of rubber damper inside, at the bottom. That makes about 0.5 cm difference compared to the old one.
          The picture shows both yokes inserted into the transmission. The left one is the new one, the old on on the right. As you can see, none goes in completely. The new one of course still has the rubber bumper inside of it.
          But, the old one, should it go all the way in? Is it possible that the mainshaft sticks out too far out of the housing?
          20210103_140643.jpg

          Comment

          • Domenic T.
            Expired
            • January 29, 2010
            • 2452

            #20
            Re: driveshaft install problems with body off

            Back in the early days when I was working at a dealer some transmission yokes would chatter on the new cars, so the fix was to use very thick grease on the shaft and inside the yoke.

            Dom

            Comment

            • Sascha P.
              Expired
              • April 7, 2019
              • 43

              #21
              Re: driveshaft install problems with body off

              I guess that is what the bumper is for. But in my case it 'steals' even more space for movement ...

              Comment

              • Domenic T.
                Expired
                • January 29, 2010
                • 2452

                #22
                Re: driveshaft install problems with body off

                Sascha,
                I think you are fixed. The fore and aft movement will be almost nothing as the differential only has a bumper and the twist is almost nothing. You will be able to push that in (I bet ) with a bit of force!
                I would still use a bit of grease to minimize wear.

                Dom

                Comment

                • Edward J.
                  Extremely Frequent Poster
                  • September 15, 2008
                  • 6940

                  #23
                  Re: driveshaft install problems with body off

                  Sara, The old slip yoke, shows you just how far it should slip in, if there is a rubber bumper I would try and remove it. Also you can try to rotate the yoke so the u-joint can slip by and under the yoke, then rotate the shaft into yoke, this will give you a little more space to work with. Also look see that someone did not over grease the slip yoke this will stop the yoke dead in in tracks. Your new yoke should slip just as far in as the old, the old yoke will ind. the movement,the reason for the slip yoke is so the yoke can slide in and out during the suspension travel. Another possibility could be the tail shaft bushing is not not pressed completely in all the way which will also will stop the yoke from slipping in completely.
                  Last edited by Edward J.; January 4, 2021, 08:44 AM.
                  New England chapter member, 63 Convert. 327/340- Chapter/Regional/national Top Flight, 72 coupe- chapter and regional Top Flight.

                  Comment

                  • Sascha P.
                    Expired
                    • April 7, 2019
                    • 43

                    #24
                    Re: driveshaft install problems with body off

                    Thank Dom,

                    I was afraid someone would so so :-(

                    Comment

                    • Sascha P.
                      Expired
                      • April 7, 2019
                      • 43

                      #25
                      Re: driveshaft install problems with body off

                      Thank you Edward!

                      By now I think I will remove the rubber bumper inside the yoke. That will give me 5 mm more space (I am counting every little bit). Also, these days I am meeting a friend who also has a 73 corvette and I will measure a few things on his car.

                      Comment

                      • Sascha P.
                        Expired
                        • April 7, 2019
                        • 43

                        #26
                        Re: driveshaft install problems with body off

                        Here is an update. The body is now back on the frame and I will try to fit the driveshaft now. Depending on how it fits I may have it shortened. I will update this thread once it is working.

                        Comment

                        • Danny P.
                          Very Frequent User
                          • June 30, 2002
                          • 341

                          #27
                          Re: driveshaft install problems with body off

                          did you try lifting diff. with floor jack maybe pinion angle different or try dropping the leaf spring end bolts and release the spring tension see if that helps, you should have more then one inch of play for driveshaft travel something wrong somewhere , i attach my 63 driveshaft setup it has more then one inch of end play ,but should go on with body off or on, just a though Z06 PHOTOS 105.jpg
                          Last edited by Danny P.; April 25, 2021, 08:47 PM.

                          Comment

                          • Frank D.
                            Expired
                            • December 27, 2007
                            • 2703

                            #28
                            Re: driveshaft install problems with body off

                            My 63 driveshaft is out right now for balancing/U-joints and the slip yoke can be pushed in nearly until the flange hits the tailshaft seal of the original Muncie ALL kinds of room.
                            Attached Files
                            Last edited by Frank D.; April 26, 2021, 06:19 AM.

                            Comment

                            • Sascha P.
                              Expired
                              • April 7, 2019
                              • 43

                              #29
                              Re: driveshaft install problems with body off

                              Just wanted to give an update. I took the drive shaft to a shop where they have shortened and balanced it. It now fits perfectly!

                              Thanks again for all thoughts and ideas.

                              Sascha

                              Comment

                              Working...
                              Searching...Please wait.
                              An unexpected error was returned: 'Your submission could not be processed because you have logged in since the previous page was loaded.

                              Please push the back button and reload the previous window.'
                              An unexpected error was returned: 'Your submission could not be processed because the token has expired.

                              Please push the back button and reload the previous window.'
                              An internal error has occurred and the module cannot be displayed.
                              There are no results that meet this criteria.
                              Search Result for "|||"