the robot welder and jig runs on a loose tolerance---it cant be changed once it is welded together---but if the axle isnt straight it should be straightened--if the k member isnt exactly straight no one notices because the front wheels can be set straight individually---there is enough adjustment in the sheetmetal no one will ever notice on the exterior--larry found his platform wasnt square when he built his own custom coilover front suspension----so he read up on it--then showed us fellow car fiends how loose it could get with the car on a lift and a tape measure---if you are going to race or drive in a spirited manner you dont want your rear end to be looking out to the left or right when you take off---shimming back one front spring hanger isnt that hard---heck if you 4 link the rear making it level and square is job number one---bob