not sure if this should be here or under drivetrain but here goes...just bought a 99 7.3 sd and the steering is stiff on the road. Its a little tight while sitting but always enough to turn the wheel without much strain... i can live with that. Main issue is while moving at normal speeds. The steering seems like its stiff and has tight spots in it to me. Almost as if the power steering stops assisting once the truck starts to roll?? Engine rpms make no difference...in neutral at idle is the same as in o.d at 1500 rpm or drive at 2100 rpm. I have a 95 compareable truck and have never had this issue. My 99 has 265 75 16 tires so i don't think thats it. I tried loosening the steering box adjustment nut (thinking someone had gotten it to tight trying to remove play...worked on another vehicle before) with no change. Changed out the powersteering fluid (synthetic atf)..no change. My truck has had one side ball joints replaced so i greased them and tie rods..no change. So what should i try/check next?? I'm thinking the other two ball joints first. By the way...the hydoboost brakes work great so i'm thinking the pump should be o.k. Anyway, i realize the net is full of steering issue threads but they all seem to deal with hard steering at a stop...like i said, mine doesn't have much issue there. Any ideas...thanks!