Even on the street the slicks got squirmy and I put my radials on the back and car goes straight at 20 mph when i punch it but with the slicks at 12 psi it gets squirmy so its gotta be the slicks right.....
well your not supposed to mix biasply (slicks) with radial tires are it can get squirly but in the drags is not usually an issue, i run 14.25 with 195-65-14 radial fronts with Hoosier 28x9-15 slick rears with no issues.
you still havn't told us the condition of the idler and pitman...