Norm Peterson
Corner Barstool Sitter
Even poly on one end will bind to some extent; my guess based on beam formulas puts the amount of 'bind' in a poly/spherical UCA at about half that of a UCA with poly at both ends. The short UCA is more severely affected partly because it is short and partly because cornering roll wants to skew the UCA relative to the car's centerline as seen in plan view. The UCA is located several inches above the PHB-defined roll center, so there has to be some relative lateral movement involved.Did you consider going with a spherical bearing in place of the rubber bushing on the diff end? I don't like poly on both ends. It tends to bind, but poly on the front with a spherical bearing on the rear works well.
Poly/spherical LCAs are less affected on both counts, roll motion being essentially 'vertical' at the LCA chassis-side pickups, which joint rotation about the bushing sleeve can accommodate without binding.
Seems there has to be a better way of handling the UCA chassis-side pivot function than either cylindrical poly or rod ends, with at least somewhat better axle location than OE rubber.
Norm
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