Rear control arm bushings

[Mark@lateral-dynamics]

Because the rear axle has to move up and down, as well as roll, you need compliance in ALL bushings that are used for the 3 Links - meaning rubber, Johnny Joints, or heims. Poly would work, but is horrible in this application and will bind, it is too stiff to give enough compliance to allow the axle to roll properly. Delrin will not work without significant binding, it might "work," but in reality the axle won't roll unless it is bending something (some combination of axle tubes, frame pickup points, etc). 3-Link is "the" way to go with a stick rear axle, let it do it's job properly by using the right bushings. An excellent choice would be a properly sized heim up front, and a rubber bushing in the rear - this offers a bit of reduced harshness relative to two heims. If it were my car, I'd go with heims of appropriate rating and quality (FK is an excellent brand).



Mark

[Merritt5]

Because the rear axle has to move up and down, as well as roll, you need compliance in ALL bushings that are used for the 3 Links - meaning rubber, Johnny Joints, or heims. Poly would work, but is horrible in this application and will bind, it is too stiff to give enough compliance to allow the axle to roll properly. Delrin will not work without significant binding, it might "work," but in reality the axle won't roll unless it is bending something (some combination of axle tubes, frame pickup points, etc). 3-Link is "the" way to go with a stick rear axle, let it do it's job properly by using the right bushings. An excellent choice would be a properly sized heim up front, and a rubber bushing in the rear - this offers a bit of reduced harshness relative to two heims. If it were my car, I'd go with heims of appropriate rating and quality (FK is an excellent brand).

Mark

Thanks for the reply and going into some detail, Mark.