1957 C1 transmission crossmeber bolts motor mount - NCRS Discussion Boards

1957 C1 transmission crossmeber bolts motor mount

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  • Dan P.
    Very Frequent User
    • December 1, 1990
    • 683

    1957 C1 transmission crossmeber bolts motor mount

    Does any one know what on the heads of the bolts for the rear tansmission bracket to tailhousing 3/8 coarse . Trans bracket to crossmember mount with rubber bushings.Whats on the head and fine or coase .I believe 7/16. What is in the heads of the 5/16 x4 bolts that hold the tranmission mount to the crossmeber fine or coarse . What is on the heads of the crossmeber to frame 3/8 x 4.
  • Chris S.
    Expired
    • March 28, 2007
    • 139

    #2
    Re: 1957 C1 transmission crossmeber bolts motor mount

    i think 7/16 course for the rubber mount and the cross member 3/8 course. The rubber mounts on mine had to have the rubber reamed than the larger bolts fitted. I believe the metal bushing is the correct diameter, at least this is what i found with mine. By the way thanks for the great job on the shocks.

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    • Dan P.
      Very Frequent User
      • December 1, 1990
      • 683

      #3
      Re: 1957 C1 transmission crossmeber bolts motor mount

      Your welcome hard to find ones that have not been oversized

      Comment

      • Loren L.
        Extremely Frequent Poster
        • April 30, 1976
        • 4104

        #4
        Re: 1957 C1 transmission crossmeber bolts motor mount

        I believe that what you are going to come to is a non-answer, in that there was a "running change" on the rear mount holes, from 3/8" to 7/16", and I have not seen even an attempt to determine when it occurred - except that every T10 I have seen in a '58 that seemed to have correct build dates for the car was a 7/16" hole.

        Comment

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