I have a shimmy at high speeds. 0 to 70 is smooth as silk, however 71mph to 80mph or 85mph the shimmy is present (not bad all the time) at times worse than others. The steering wheel shakes left to right (not up and down) i can exceed 90mph and out run the shimmy! smooth as silk @>90mph.
New upper and lower (poly) bushings (6mos), new upper and lower ball joints (year). New pitman and idler arm 2 mos).
no visible loosness in the front suspension.
any ideas? replace ties ( probably orignal)
69 X-44 base coupe, ZZ4, 16lb nodular flywheel, Center force DF clutch + PP, Holley 600DP, Hooker super comp 1 3/4 ceramics, 2.5" dual exhaust w/ X-pipe, flowmaster 40 series mufflers.