There are two types of vertical bushings used in control arms where the control arm mounts to the K Frame. There are normal type rubber bushings which work fine, and then there are spherical ball joint bushings which are superior. Spherical bearings last longer and have a more fluid movement than a bolt through a rubber bushing.
From roughly 2007-2022 roughly, we could get Moog control arms with spherical bushings. Then, Moog discontinued the control arms and the separately sold spherical bushing.
In 2026, we were able to find a small batch of the spherical ball joints, and so we then took those spherical ball joints along with new Moog regular control arms, and we burned out the bushings, pressed in the spherical ball joints and lastly we put in new Prothane horizontal urethane bushings for better cornering and handling.
We have about 14 pairs of these control arms ready to go, and once they are sold out, we likely may never get more spherical ball joint control arms in again.
Tech discussion about spherical bushings:
1. Zero Deflection
Standard rubber bushings "squish" under load. When you turn the steering wheel or hit the brakes, the rubber compresses before the car actually reacts. Spherical joints are metal-on-metal (usually with a PTFE/Teflon liner).
2. Greater Range of Motion
Traditional bushings rely on the twisting of rubber, which can bind if the suspension travels too far. Spherical joints allow the control arm to pivot freely in multiple planes without resistance.
3. Improved Alignment Stability
Because the joint doesn't move laterally, your camber and caster settings stay consistent even under heavy cornering loads.
4. Direct Road Feel
Since there is no rubber to dampen the vibrations, the "conversation" between the tires and your hands is much louder.
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