11-04-2019, 06:13 PM
Well, it’s because if you mount the radius arms spaced away from the centreline, the assembly acts as an anti roll bar, with the axle as the torsional member. A 1.75in dia axle tube has considerable torsional stiffness. Roll bar stiffness = understeer. If you attach the radius arms to the chassis side members you have to lose the roll bar effect somehow. I’m sure there must be other ways but a slip joint in the axle is a simple way of doing it.
Alan Fairless