The rear axle shuld be 90 Degrees to the mid line fore/aft of the chassis. Though given all the flexing involved in practice I doubt that this is maintained. Additionally I'm not sure what the tollorance on spring mounting points are or allowable bushing deflection.

I'm guessing if you have to ask - you have a problem of some sort - Classic Morgan set-up is a bit of a blunt tool then you get to this level of fidelity.

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