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Thread: C4 rear end adjustment

  1. #21
    Registered Member chevynut's Avatar
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    Quote Originally Posted by Bow tie downunder View Post
    The front is level.The measurement at the batwing is 92 mm and 95 mm.The spring bolts are the same on bothe ends .The only thing I can see that is different is position of the camber adjustment.
    Where are you measuring the height that's off? At the bumper or at the rear wheelwell?

    What are the 92mm and 95mm measurements? Is that right (92) and left (95) from spring to batwing?

    If the front is level and the back is not, it seems like there's something wrong with the frame. I don't see how the front can be level if the back isn't, unless the frame is twisting or one of the the rear corners is too high or low. I have seen that happen when we welded the batwing mounts and axle bumpers to the frame at the rear hump. We have had to correct that in the past. If the problem is the suspension, and the right rear is low, I would expect the left front to be higher than the right front.

    I would try to set the frame perfectly level just forward of the rear wheels at the bottom of the hump, then measure from the floor to the bottom of the frame just forward of the rear bumper on both sides to see if the frame is twisted or sagging on one corner. You could put the frame on exactly the same size blocks to level it.

    I don't understand your comment about the camber adjustment. What you're showing in the pic is the toe adjuster so I assume that's what you mean. I don't see anything wrong there.

    There are supposed to be shims between the spring and the differential. Are they the same thickness on both sides? It wouldn't take much difference to cant the spring at the end.
    Last edited by chevynut; 03-31-2023 at 08:40 PM.
    56 Nomad, Ramjet 502, Viper 6-speed T56, C4 Corvette front and rear suspension


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  2. #22
    Registered Member chevynut's Avatar
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    Quote Originally Posted by Bow tie downunder View Post
    Can you supply the dropped toe adjuster ,they are not on eBay
    I can't but I know who can. He's been making them for quite a while, so I never did. I'll PM the info.
    56 Nomad, Ramjet 502, Viper 6-speed T56, C4 Corvette front and rear suspension


    Other vehicles:

    56 Chevy 2-door BelAir sedan
    56 Chevy 210 4-door sedan
    57 Chevy 210 4-door sedan
    1962 327/340HP Corvette
    1961 Willys CJ3B Jeep
    2001 Porsche Boxster S
    2003 Chevy Silverado 2500 HD Duramax
    2019 GMC Sierra Denali Duramax

  3. #23
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    D87B840C-7073-4D61-8C07-46EA904F0EC5.jpegI’m measuring at the rear wheel well through the centre of the wheel. From the back of the car the right hand side is lower than the left. The right hand side is 92mm from the batwing to the spring. The front is level with Coilover adjustment. From the back the left front is adjusted to make the front of the car level D3A11C75-CBD8-4744-B70B-A77793ACB59F.jpeg
    Last edited by Bow tie downunder; 03-31-2023 at 09:02 PM.

  4. #24
    Registered Member chevynut's Avatar
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    It looks to me like your driver's side coilover is adjusted quite a bit higher than the passenger side. Looks like it's at least 3 turns higher. Where are you measuring the front end for level? See if the frame is actually level in front.
    56 Nomad, Ramjet 502, Viper 6-speed T56, C4 Corvette front and rear suspension


    Other vehicles:

    56 Chevy 2-door BelAir sedan
    56 Chevy 210 4-door sedan
    57 Chevy 210 4-door sedan
    1962 327/340HP Corvette
    1961 Willys CJ3B Jeep
    2001 Porsche Boxster S
    2003 Chevy Silverado 2500 HD Duramax
    2019 GMC Sierra Denali Duramax

  5. #25
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    Thanks

  6. #26
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    Iím considering coilovers .Could you recommend a spring rate and shocks .

  7. #27
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    The numbers on the spring are RHZ
    1-6

  8. #28
    Registered Member chevynut's Avatar
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    Quote Originally Posted by Bow tie downunder View Post
    I’m considering coilovers .Could you recommend a spring rate and shocks .
    I'm not sure coilovers are the key to solving the root cause of your leaning problem. As I mentioned, the front coilovers are not adjusted the same so there's something going on with your chassis/suspension and I'd be inclined to find the root cause before trying to bandaid it. I'd measure the length of each front shock to see if they are the same length at ride height. Your left front shock is adjusted higher and if the shock is actually longer eye to eye than the right side, that would explain why your right rear is low.

    To install coilovers you would have to have a shock bar in the rear. I don't like trying to mount the rear shocks vertically like in the C4 Corvettes and some conversions I've seen. The shocks need to be very short and there's just no room for them in the rear unless the top of the shock is inboard. I can't recommend shocks or spring rates without knowing the length between the mounting points at your desired ride height. What is your front coilover spring rate?
    56 Nomad, Ramjet 502, Viper 6-speed T56, C4 Corvette front and rear suspension


    Other vehicles:

    56 Chevy 2-door BelAir sedan
    56 Chevy 210 4-door sedan
    57 Chevy 210 4-door sedan
    1962 327/340HP Corvette
    1961 Willys CJ3B Jeep
    2001 Porsche Boxster S
    2003 Chevy Silverado 2500 HD Duramax
    2019 GMC Sierra Denali Duramax

  9. #29
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    12 CS 350 on the front

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