Frame number decoding

Discussion in 'Chassis restoration' started by jmbarber, Mar 20, 2020.

  1. jmbarber

    jmbarber Well-Known Member

    I tried this on another thread, but I think it was old so trying a new one.

    I am replacing the frame on my 1969 GS400 Stage 1 convertible. The replacement frame has numbers that do not mean anything to me, so please help.

    The numbers are faint in some areas so a couple of the numbers are a guess.

    396 and then either (6 or 0), 7, s (with a circle around it), 291

    Can you numbers gurus help me with this?
  2. flynbuick

    flynbuick Super Moderator Staff Member

    The S with a circle I recall stands for A.O. Smith, the company that made that frame. It makes items like water heaters today.

    A picture would help.
  3. jmbarber

    jmbarber Well-Known Member

  4. jmbarber

    jmbarber Well-Known Member

    A picture did not show the numbers, I had to do a tracing to draw them out.
  5. BrianTrick

    BrianTrick Brian Trick

    84E4F369-CA63-45B3-8504-5345410C1090.jpeg This was from a 68 GS convertible frame I did last year.
  6. thepartsman

    thepartsman Back Ordered Again ?

    It appears you have a '70 frame.

    Boxed frame = convertible
    Open = Coupe

    All '70 frames start with 39607xx ( except the late BB frame)

    If open frame you need to do a little more cleaning to see at least the last digit of the whole number
    to determine if it is a SB or BB frame.

    Hope this helps,
  7. jmbarber

    jmbarber Well-Known Member

    Thanks. It is a boxed frame for my convertible, all the bracing is correct for that. Your numbers follow what you have said about a 70 frame. I can see the 39607, but there is bare metal after that until the S in a circle. Then my 291 and bare metal again.

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