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  1. #1

    Default Stock 1979-84 rear swaybar mounting bolt specification

    I'm looking for anyone that has a Mustang with the original swaybar mounting bolts installed on their car. What are the numbers stamped into the head of these bolts?
    Jack Hidley
    Maximum Motorsports Tech Support

  2. #2
    Moderator wraithracing's Avatar
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    Quote Originally Posted by Jack Hidley View Post
    I'm looking for anyone that has a Mustang with the original swaybar mounting bolts installed on their car. What are the numbers stamped into the head of these bolts?
    I have the original bolts in the sway bar of my 82 RS and can check them tomorrow at the shop and post them up.
    ​Trey

    "I Don't build it hoping for your approval! I built it because it meets mine!"

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  3. #3

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    I believe my 84 GT does. I can check here in a few minutes when I get home.
    Brock
    1984 Mustang LX Convertible 3.8L V-6/Auto (SOLD)
    1984 Mustang GT Hatchback 5.0 V-8/5 Speed

    I'm an FEP Supporter and proud of it. Are you?

  4. #4

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    Here’s a pic of mine Jack.

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    Brock
    1984 Mustang LX Convertible 3.8L V-6/Auto (SOLD)
    1984 Mustang GT Hatchback 5.0 V-8/5 Speed

    I'm an FEP Supporter and proud of it. Are you?

  5. #5
    FEP Member Patrick Olsen's Avatar
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    G'01. Huh, must be some sort of obsolete spec.

    '89 GT convertible - not a four-eye
    '82 Zephyr Z7 - future track car

  6. #6

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    It is the specification prior to the G16 classified one.
    Jack Hidley
    Maximum Motorsports Tech Support

  7. #7

    Default

    Is that not a metric size bolt (10.9mm) ? It is just a shade under 7/16"
    84 Cougar, 88 HO with 700DP, Edelbrock RPM intake, 1.7 RRs, shorty's and SS exh, T-5, KC clutch, Hurst pro billet, line loc, 8.8, 4.10s, suspension mods....blah, blah,blah.

    71 Comet, 289, Liberty TL, 9", 6.00s, 11.9x @ 112.... blah, blah, blah.

  8. #8
    FEP Supporter 4-barrel Mike's Avatar
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    10.9 is the metric bolt grade, like a standard US grade 8, but metric.

    https://www.boltdepot.com/fastener-i...ade-Chart.aspx

    Mike
    1985 ascMcLaren 5.0 SC Roadster
    My '78 Fairmont build - http://vb.foureyedpride.com/showthre...539-78-Big-Red

  9. #9

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    Quote Originally Posted by 4-barrel Mike View Post
    10.9 is the metric bolt grade, like a standard US grade 8, but metric.

    https://www.boltdepot.com/fastener-i...ade-Chart.aspx

    Mike
    I knew it had something to do with metric but forgot until now. Thanks
    84 Cougar, 88 HO with 700DP, Edelbrock RPM intake, 1.7 RRs, shorty's and SS exh, T-5, KC clutch, Hurst pro billet, line loc, 8.8, 4.10s, suspension mods....blah, blah,blah.

    71 Comet, 289, Liberty TL, 9", 6.00s, 11.9x @ 112.... blah, blah, blah.

  10. #10
    FEP Senior Member 83gt351w's Avatar
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    Quote Originally Posted by Jack Hidley View Post
    It is the specification prior to the G16 classified one.
    Lmao.

  11. #11

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    For documentations sake, the bolt is M10 x 30mm -1.5 Grade 10.9.
    Jack Hidley
    Maximum Motorsports Tech Support

  12. #12

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    For some reason I cannot post pics? But, for what it's worth I just checked my 79 cobra and the big bolts are a 15mm head with 9.8 on the head and the little bolts are a 13mm head with 10.9 on the head. If I get the pic thing figured out I'll post them

  13. #13

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    Your rear swaybar uses two different sized bolts?
    Jack Hidley
    Maximum Motorsports Tech Support

  14. #14

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    Yes, if you PM me I'll text you pics. I still cannot add pics

  15. #15

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    If itís a street car you may prefer it without the rear sway bar. They cause horrible rear suspension bind and the cars are far more predictable without the rear bar. Especially if you donít have a panhard.

    Or you may also like an adjustable MM bar that mounts in a way that avoids the binding.

    I ditched my rear swaybar on my 86GT thatís lowered. Also on my sonís stock height 86 convertible. Lots safer on damp or wet roads.

  16. #16

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    Here are a couple of the photos that Shane was unable to post. I had completely forgotten that in the early Mustangs, Ford used a simpler swaybar design where is was all bent in one plane and then drop brackets were used to connect the swaybar to the RLCAs. It appears that Ford used a bolt with a lower load rating where it is larger diameter and the higher load rating bolts are the smaller diameter ones.

    Shane, can you put a set of calipers on one of the bars and measure its diameter?
    Attached Images Attached Images    
    Jack Hidley
    Maximum Motorsports Tech Support

  17. #17

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    I forgot my caliper, but a tape measure suggests 9/16

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