1964 2 speed power glide 3.36 non posi carrier - NCRS Discussion Boards

1964 2 speed power glide 3.36 non posi carrier

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  • William K.
    Frequent User
    • April 1, 1990
    • 37

    1964 2 speed power glide 3.36 non posi carrier

    Thinking of swapping my original rear end 3.36 non posi for a 1975 3.55 posi any pros or cons with this set up? car is a base 327/250 hp. would this be a direct swap or are any modifications required?
  • Joe L.
    Beyond Control Poster
    • February 1, 1988
    • 43221

    #2
    Re: 1964 2 speed power glide 3.36 non posi carrier

    Originally posted by William Kiefiuk (17075)
    Thinking of swapping my original rear end 3.36 non posi for a 1975 3.55 posi any pros or cons with this set up? car is a base 327/250 hp. would this be a direct swap or are any modifications required?
    William------

    The 1964 differential uses a 1310 series u-joint flange; the 1975 uses a 1330 series u-joint flange. You would have to change the pinion flange on the 1975 differential unit OR you could use a conversion u-joint. You cannot transfer the 1964 pinion flange to the 1975 unit because the spline count is different.

    The conversion u-joint is probably the easiest thing to do.

    The only other thing you may have to do is to change the speedometer driven gear.
    In Appreciation of John Hinckley

    Comment

    • Gary R.
      Extremely Frequent Poster
      • April 1, 1989
      • 1798

      #3
      Re: 1964 2 speed power glide 3.36 non posi carrier

      As Joe mentions the 63-4 diffs used a 17 spline pinion so you will need a 1310 yoke for the '75. Your open diff is actually stronger then a 63-64 posi. The pinions were weak as well.

      Now if you have a stock, untouched 75 diff you should really check it before installing it. I would rebuild it. There is not going to be much difference between the 336 & 355's. If you want want more launch go with a new set of Toms 373's.

      General information on 73-79 differentials

      1- soft faced axles- if original you have to check them and either replace or have them hardened if still good.
      2- posi clutches- these use what I call "snowflakes" a term which seems to have caught on over the years. They are not too good.
      3- Housing and posi case- good units but the cases have to be checked for cracks
      4- 10-17 x 17 spiders- very good gears and the best of the 63-79 run.

      I wrote this thread 11 years ago, it will help you.

      Comment

      • William K.
        Frequent User
        • April 1, 1990
        • 37

        #4
        Re: 1964 2 speed power glide 3.36 non posi carrier

        Thanks for the quick response conversion u-joint readily available?

        Comment

        • Joe L.
          Beyond Control Poster
          • February 1, 1988
          • 43221

          #5
          Re: 1964 2 speed power glide 3.36 non posi carrier

          Originally posted by William Kiefiuk (17075)
          Thanks for the quick response conversion u-joint readily available?
          William------


          Yes. NAPA #UJ353 is one that's readily available. I'm sure there are other brands. There must be a Dana-Spicer equivalent but I do not have the part number.

          If it were me, I would replace both the forward u-joint with a standard u-joint and replace the rear with the conversion u-joint. Then, with the u-joints installed, I would have the driveshaft precision-balanced at a driveline shop.
          In Appreciation of John Hinckley

          Comment

          • Terry D.
            Extremely Frequent Poster
            • May 31, 1987
            • 2691

            #6
            Re: 1964 2 speed power glide 3.36 non posi carrier

            William
            Why are you considering this project? As stated you are not going to notice much difference and with a 250hp I don't see the need for a posi. Seems like a lot of work and money for very little results. Just sayin !

            Comment

            • William K.
              Frequent User
              • April 1, 1990
              • 37

              #7
              Re: 1964 2 speed power glide 3.36 non posi carrier

              Mine is making an occasional funny sound and probable needs to be rebuilt, think rebuild or possible change

              Comment

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