Did you do any work on the bearings? The "torque" is usually very lite (12lbft or so) and is done just to seat the bearings. After torqueing it is usually directed to back the nut off to the first hole in the spindle and put the cotter pin in at that point. You NEVER want to run the nut all the way down and then tighten it. The bearings have to have some room to spin and tightening the spindle nut will clamp the bearings so they can't. If this what you've done you will probably need new bearings and possibly spindles if you have turned them blue and removed the heat treat...
Mark