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Technical Vibration issue

Discussion in 'The Hokey Ass Message Board' started by bustingear, Nov 20, 2016.

  1. bustingear
    Joined: Oct 29, 2002
    Posts: 2,014


    Just finished installing a T5 transmission behind my 350 in my model a sedan. I took out a Muncie 319 3 speed. What i notice now is smoother running except when i switch into 4th or 5th on the highway i get some vibration. I did replace the universal. If i hold on and continue to accelerate in either situation or shift down it goes away ...its just on the initial gear change. No issues in lower gears under acceleration
    i just had the drive shaft shortened and balanced for the new application and did not notice this in the old set up. There is some angle between the transmission and rear end with the transmission slightly higher. Thoughts?
  2. dirty old man
    Joined: Feb 2, 2008
    Posts: 8,912

    dirty old man
    Member Emeritus

    If the angles involved at trans and difdf are not opposing and equal you will get a vibration. I'm not up on how to do a sketch and post it, but basically the horiz centerline of trans output must be paralell, but one above the other in the vertical side view. If that doesn't make sense, I suggest a search for driveshaft and U joint angles, as I have seen sketches on this in previous threads..
  3. bustingear
    Joined: Oct 29, 2002
    Posts: 2,014


    just a few cheap washers under the tranny mount to get the drive shaft angle right and it is amazing what a change it made
    loudbang, bobg1951chevy and dan31 like this.
    Joined: Feb 16, 2010
    Posts: 628


  5. BJR
    Joined: Mar 11, 2005
    Posts: 7,473


    If you find all the angles are correct, check and see if the driveshaft is a little too short. That can cause a vibration also.
    loudbang likes this.

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