I have a 2003 4x2 with a spindle/leaf spring lift with 33" tires. I have had my wheels rotated/ balanced and also have had a front end alignment after replacing the camber washers. I still have a vibration when traveling between 60-70 mph. Any suggestions? I read the previous posts about drive shaft vibrations occuring with the steel drive shafts, but it seemed to be with 4x4 only. Help please!!!