Thanks for the replies, I'm going to get the car up off of the ground and check if anything is loose, everything is brand new up there , but I'll give it the once over. I had absolutely no shimmy with the bias tires and that is what has me puzzled. I put hoosier's pro-street 31-16.5-15's in the rear and kuhmo 165-80-15's up front (the smallest 15's I could find) . They were all spin balanced and rechecked. The caster according to the guy who set the frontend up is at 8 degrees positive. I'm wondering about toe in / out though.