I recently put a nice new set of radial tires on my 65 Chevy C20 replacing the old worn out bias plys. It now darts left to right when going about 40mph and faster like the steering has become overly sensitive with any slight movements by me of the steering wheel, and taking even slight curves in the road is really scary. Its a white knuckle situation. I did an internet search about going from bias to radials on older vehicles and found plenty of the same cases...these older vehicles were set up to have bias plys not radials and going to radials definitely changes things. So I take the truck to the local shop for them to check the alignment and the mechanic tells me the same thing and says this, "Go put power steering on the truck and then bring it back and I'll set the alignment correctly for the radials". I dont need the expense of installing power steering on my truck and since the 1970s there has to be thousands and thousands of older trucks that have been switched to radials...there has to be a "simple" fix to this type of problem. I would think that many of you have experienced the same thing, how do I fix this?