EATON Detroit Spring

The leading manufacturer of leaf and coil springs for the street rod and restoration automotive industries

We Help Maintain American Icons by Manufacturing Leaf and Coil Springs Right Here in America

Phone: 1 (313) 963-3839
Fax: 1 (313) 963-7047

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MENUMENU
  • Home
  • Products
    • Suspension Parts
      • Leaf Springs
      • Coil Springs
      • Shocks
      • Attaching Parts And Hardware
      • Installation Kits
      • Leaf Spring Shackle Replacement Kits & Parts
    • Street Rod Suspension Parts
      • Mustang II Front End Springs
      • 48 Inch Truck Springs
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      • Tech Questions
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      • Featured Elsewhere
      • EATON Detroit Spring Podcast
      • Buy Ford Manuals
    • Spring Tech 101

      We have been manufacturing springs for American vehicles for over 80 years. Our process and expertise has been continuously refined and improved over the century and our Spring Tech section reflects some of that specialty knowledge.

      Browse our many articles, watch videos produced in partnership with AutoRestoMod, and learn all about your spring suspension here.

    • Browse By Topic
      • Leaf Springs
      • Coil Springs
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  • Click to Call Now: 1 (313) 963-3839

Shock And Springs Fight Each Other In A ’64 Straight Axle Vette

Howdy,

I have a 64 vette, with a Strange Ford 9”. Yes, it’s a 64 straight axle car.

Former drag car. It’s set up like a 62 for the leaf springs.

I have 4 leaf springs on there now, which are for a 62, which I purchased from a local vette resto shop. They have been on the car for about 5 years, which equates to about 10,000 miles. None of the leafs are cracked. I have been trying to reduce the bouncy bouncy, bottom out syndrome.

I only have about 1 3/4 suspension travel before bottoming out. I am using QA1’s on the rear, 12 way’s. I can set the shocks to greatly reduce compression travel to help avoid bottoming out the suspension, but then it seems the bouncy bouncy is worse, along with ride quality.

I realize a 64 vette wasn’t designed for this setup, but I would think there would be a solution here. I did need to add a 2 deg shim for my pinion angle. Would that affect the spring rate?

Any help here at all would be excellent.

Thanks much, John.

John

I love how us guys are always messing with cars to make them different. But give me more info on her. What engine? Tranny? HP? I bet she is bitchin.

OK, enough drooling, let’s solve your problem.

The 1st thing is the amount of suspension travel is about as minimum as you can get with a Vette. So we do not have much to work with, but I think there is room for improvement.

The QA1’s are an excellent shock, but shocks are designed to control a spring’s rebound, not it’s compression. I know, with QA1’s you can do both but let’s allow the spring to do it’s job and the shock do it’s. Right now, the shock and spring are fighting each other.

The 4-leaf spring has a rate of 110 Lbs. The very rough definition of rate is it is the amount of weight it takes to move a spring one inch. I would change to a 5 leaf spring, which has a rate of 145 Lbs, and back the adjustment of the shock way, way down.

I think you will see/feel improvement to the ride.
Mike

Filed Under: Tech Question Tagged With: Custom Designing Springs, Leaf Springs, Manufacturing Springs

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OEM Replacement & Custom Springs

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