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  1. #1
    New Member
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    Nov 2018
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    montana
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    Corvette(s)
    1977 Tan Corvette with 1992 corvette LT1 engine
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    Default C3 rear sway bar

    I am going to add a rear sway bar to my 77 C3. I see several thickness' for the bar from 5/8 to 3/4 to 7/8 and probably more. What do you guys think would be the best fit for a weekend cruiser?

  2. #2
    Administrator Tom Bryant's Avatar
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    Nov 2000
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    Edgerton, Ohio, United States
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    Corvette(s)
    1959 black 270hp (9/2/69) 1981 Beige L81(10/20/80)
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    Default

    If your '77 would have had the FE7 heavy duty suspension it would have had a 11.12MM rear bar. That's about .438 inches so even a 5/8" (.625) bar would be a heavier bar than a '77 HD. Leaving the springs and front bar original I really can't see going any thicker than that. If it oversteers really bad when pushed you might want to consider going heavier but if it doesn't, then the 5/8 should be a good choice.
    Interesting fact is that your front bar is the same part number as several Corvettes clear back to 1963 including some with special suspension and some big block cars. Must be an ok bar on the front already. If you change out the rubber grommets on the sway bar links to urethane you will get sharper response, especially if the rubber ones are flattened out and well past their life cycle. Same goes for the mountings but be sure to lube them with the manufacturer's recommended lube to prevent squeaking.

    Tom
    NCRS 1360.............SACC 2082.............C1 Registry..............L81 Registry
    1959 Chevrolet Corvette 1981 Chevrolet Corvette , 350 L81 automatic Frost Beige

  3. #3
    New Member
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    1977 Tan Corvette with 1992 corvette LT1 engine
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    Default

    Thanks Tom. I think I will go with the smaller bar. It makes sense for my driving style. I have previously changed all the rubber on the front. Thanks again.

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