Chevrolet C60s - Front Wheel "shimmy"

[cordenj]

Fitted the larger 6 degree wedges last night and lowered the tyre pressures on front to 36 psi from 43.

At same time checked shock absorbers when the connecting arm was detached from axle, and both appear to be working correctly.

Just been for a short test drive and the shimmy is WORSE. Any speed above 20 mph it will start without warning and not needing a pothole, so that rather stuffs it for W&P!

Could it really be the tyres? I didn't get shimmy with the "square shouldered" tyres that were on it but changed them as they looked cracked. Tragedy is that I got rid of them as thought they were scrap!! The replacement ex-Bedford RL 11x20 bar-grips are far more "round shouldered".

So, any ideas welcome now as I really thought the logic of sagged springs leading to reduced caster angle made a lot of sense.

All I can think of is waiting for the new tyres we are getting at W&P and fitting them on the front.