I have a vibration in the steering wheel when I let off the gas.Does the front drive-shaft turn when in two hi?The 4x4 switch is in the cab, electronic.1998 F250LD 93000mi.Auto trans.If I put it in neutral it goes away. Did a search and read hundreds of posts none described my symptoms.I know it could be a ton of things, but this truck is in A1 shape.Ive checked rear drive-shaft and the only slop I have is when shifting into reverse.All fluids are good front/rear diff. and trans.The only work Ive ever had done besides routine maintains was the PCM reprogrammed at 15000 mi. As I sit hear and think about it I never did check the front drive-shaft!hhhhuuuummm.THANKS!!