I believe if the steering doesn't shake then the problem is in the caster,first question is did you have the front axle out and dismanteled if so chk and make sure the axle is not in backwards,i dont know about Durant but the devaux has the manuf name on the front of the axle,i would try shimming the axle between the springs and axle or take it somewhere where they do old cars or trucks alignments with the axle,the caster is often overlooked and that can make it wonder, dave