'67 half shaft u-bolt - NCRS Discussion Boards

'67 half shaft u-bolt

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  • Leif A.
    Extremely Frequent Poster
    • August 31, 1997
    • 3614

    '67 half shaft u-bolt

    Can someone please give me the size of this bolt. GM #3843384. Someone in the past failed to peen over the French lock. Something else to check while under the car.
    Attached Files
    Last edited by Leif A.; November 18, 2022, 09:52 AM. Reason: capitalized French
    Leif
    '67 Coupe L79, M21, C60, N14, N40, J50, A31, U69, A01, QB1
    Top Flight 2017 Lone Star Regional
  • Gene M.
    Extremely Frequent Poster
    • April 1, 1985
    • 4232

    #2
    Re: '67 half shaft u-bolt

    7/16” fine thread

    Comment

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

      #3
      Re: '67 half shaft u-bolt

      Agree.........but specifically 7/16 x 20-1-1/8 Grade 8. Paragon and others have them. You hardware store may have something as well, but the 1-1/8 length may be an issue unless you cut it........and Grade 8 is tough to cut.

      Larry

      Comment

      • Leif A.
        Extremely Frequent Poster
        • August 31, 1997
        • 3614

        #4
        Re: '67 half shaft u-bolt

        Thank you gentlemen. They're all loose back there. 60-90 lb ft sound right?
        Leif
        '67 Coupe L79, M21, C60, N14, N40, J50, A31, U69, A01, QB1
        Top Flight 2017 Lone Star Regional

        Comment

        • Gary J.
          Extremely Frequent Poster
          • April 1, 1980
          • 1231

          #5
          Re: '67 half shaft u-bolt

          Check the assembly manual it should have the torque values. I am not at home to check my chart.

          Comment

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

            #6
            Re: '67 half shaft u-bolt

            Originally posted by Leif Anderson (29632)
            Thank you gentlemen. They're all loose back there. 60-90 lb ft sound right?
            Chevrolet Service Manual says 75 ft-lbs. Lightly oiled. A regular steel French Lock will begin to deform at torque below the spec. Use stainless steel French Locks ( a bit hard to find, but available) and/or a bit of never-seize just under the bolt head.

            French Locks only go on one way/orientation to allow you to get a solid socket on the bolt head. Otherwise you will have difficulty. Check the others on your car for correct orientation, or correct orientation is is shown n Chevrolet Service Manual pictures.

            Larry

            Comment

            • Richard G.
              Extremely Frequent Poster
              • July 31, 1984
              • 1715

              #7
              Re: '67 half shaft u-bolt

              Since they were all loose all the bolts are now suspect.
              To be on the save side I would replace all of the them.
              BTW; you can see the French Lock deformation in the direction of tightening the bolts. Just like Larry predicted.
              This may not be a lock tab failure but an under torque situation.
              After a Corvette is put back on the road, after servicing the axles, I recommend they be checked for torque after 50 miles.
              Then bend the tabs over. SS tabs sound like a great idea.

              Rick

              Comment

              • Leif A.
                Extremely Frequent Poster
                • August 31, 1997
                • 3614

                #8
                Re: '67 half shaft u-bolt

                Thank you everyone. Last evening I ordered 8 new bolts and 4 SS french locks from Paragon. I was going to ask about a touch of Loctite blue...thanks Larry.
                Leif
                '67 Coupe L79, M21, C60, N14, N40, J50, A31, U69, A01, QB1
                Top Flight 2017 Lone Star Regional

                Comment

                • Richard G.
                  Extremely Frequent Poster
                  • July 31, 1984
                  • 1715

                  #9
                  Re: '67 half shaft u-bolt

                  For those that don't know, Loctite blue is the stuff for "service removable" items.
                  I think it's a great idea. Works better than the french locks.
                  Only down side it you will not be able to re-torque them.
                  But not much because they will not come loose.
                  Rick

                  Comment

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