What amount if any, are you using under the axle for camber adjustment. The '37 manual calls for
1 3/4* (=/-) 1/2 degree of caster. I don't know what mine has, but it wonders around the road more then I like. It doesn't seem to have a center, its always left or right. At 65 to 70 it gets old! I have replaced the kingpins and everything related to steering. Box has all new bushings and bearings. Everything is still tight, so I hought maybe that was the problem, now I am not sure. I am thinking, now that everything is new, the caster angle is off. Before heading to the shop, I thought I would ask what you are using. Joe