C1 Driveshaft play at slip yoke and angles - NCRS Discussion Boards

C1 Driveshaft play at slip yoke and angles

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  • Paul J.
    Expired
    • June 30, 1999
    • 83

    C1 Driveshaft play at slip yoke and angles

    I could not find this answer in the archives other than there is 1"-2" play in driveshaft length due to suspension changes.
    I am replacing the pg in my '61 with a 2004R and need to set driveshaft angle. The pinion angle is set by the factory but now with the need to change the slip yoke to a 27 tooth and adjusting engine and trans to allow for clearance for the 2004R I need to get a proper driveshaft angle. I also need to determine the correct length of the yoke and/or the driveshaft.
    If I raise the rear axle up to the rubber bumpers and lower the axle to rest on the rebound straps how much clearance should there be between end of yoke shaft and the end of the output shaft at the max and min positions of the axle to avoid the driveshaft from contacting the trans? I am assuming the engine and trans will not change because of the mounts at front and rear of the drive train once the trans mount location is determined.
    It seems that I won't be able to change the angle much but I do want to get it set as I can.
    I hope you understand what I am looking for. Any suggestions?
    Thanks
  • John H.
    Beyond Control Poster
    • December 1, 1997
    • 16513

    #2
    Re: C1 Driveshaft play at slip yoke and angles

    Paul -

    The rule of thumb I've always used on other project cars is to have at least 3/4" clearance from the forging part of the yoke to the tailhousing rear seal with the suspension compressed so the yoke is fully forward; this ensures enough fore-aft clearance to remove the driveshaft (rear U-joint caps clearing the pinion yoke).

    Comment

    • Dick W.
      Former NCRS Director Region IV
      • June 30, 1985
      • 10483

      #3
      Re: C1 Driveshaft play at slip yoke and angles

      You can adjust the pinion angle with the use of caster shims under the rear springs. Sometimes this is the easiest way. If you can keep the C/L of the output shaft approximately the same as the old PG you will not have to do much in the way of shimming.
      Dick Whittington

      Comment

      • Paul J.
        Expired
        • June 30, 1999
        • 83

        #4
        Re: C1 Driveshaft play at slip yoke and angles

        Thank you John.
        Dick is it really possible to change the angle with shims. With the pins on the axle housing in the springs isn't it a permanent built in angle?

        Comment

        • Dick W.
          Former NCRS Director Region IV
          • June 30, 1985
          • 10483

          #5
          Re: C1 Driveshaft play at slip yoke and angles

          Truck shims come in different widths and have a hole in the center for the head of the spring center bolt.
          Dick Whittington

          Comment

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