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- out of balance tyre/rim combination
- out of round tyres
- loose front hub adjustment
- worn tie rod end joints
- worn suspension bushes
- worn front strut and mount rubbers
- worn inner tie rod ball joints
- worn steering box mounts
- worn or loose steering shaft spline or u-joint
Jack the truck up and see if it's hard to turn . Now if you did nor flush power steering system the pump could have gone bad . Most power steering pumps carry a warranty on them wouldn't hurt to swap it out he can do the work yourself but it sounds like your rack and pinion is starting to fail
Check the power steering fluid, it could be that it's just low. If it's full it might be time to get it changed. Also check the tension on the motor belt. If it's loose you won't get full power to the pump.
Priority Action Part Type Cause 1 Inspect Power Steering Fluid Low Power Steering Fluid Level. 2 Inspect Power Steering Pump Worn out or Damaged Power Steering Pump. 3 Inspect Power Steering Hose Leaking or Incorrectly Installed Power Steering Hose. 4 Inspect Belt Tension Incorrect Belt Tension Will Allow Belts to Slip. 5 Inspect Belt Incorrectly Routed, Adjusted(Tensioned), Missing or Worn Drive Belt(s). 7 Inspect Ball Joint-upper Worn, Damaged, or Faulty Ball Joint. 8 Inspect Ball Joint-Lower Malfunctioning Ball Joint.
What happes when a vehicle experiences a loss of power steering, is that the car reverts to a manual steering car (like in the Model T days), making steering difficult, especially at low speeds, and during low speed maneuvering.
YOU HAVE AIR IN THE POWER STEERING SYSTEM.YOU NEED TO BLEED POWER STEERING PUMP FIRST BEFORE DRIVING VECHICLE.CHECK POWER STEERING FLUID LEVEL ADD MORE POWER STEERING UNTIL REACH FULL COLD MARK..RAISE VECHICLE FRONT WHEELS OFF THE GROUND.START ENGINE LET IT IDLE WHILE TURNING STEERING WHEEL LEFT TO RIGHT NON STOP DONT LOCK OR STOP STEERING WHEEL KEEP TURNING IT SEVERAL TIMES CHECK POWER STEERING FLUID IF LOW ADD UNTIL YOU GET COLD MARK ON DIP STICK DONT OVER FILL POWER STEERING PUMP BLOW A SEAL.IF POWER STEERING FLUID LOOK TAN COLOR SYSTEM FULL OF AIR.TURN OFF IGNITION LET CAR SET FOR A WHILE CHECK FLUID LEVEL.IF STEERING WHEEL FEEL STIFF HARD TURNING DONT DRIVE CAR UNTIL YOU HAVE NORMAL STEERING.IF STILL HAVE AIR IN SYSTEM BLEED SYSTEM UNTIL AIR IS OUT.
Normally when you get tightening at the steering wheel that means that the rack and pinion is failing. A rack and pinion can cause tightening then before you realize it your steering is back to normal. I would have it checked. Good Luck
See if you have a power steering pressure switch. Some cars have a variable orifice power steering switch that varies pressures based on speed and how fast you are turning. For example, in a parking lot (low speeds), power assist would be greatest whereas at higher speeds, it would be lowest. If you have a power steering pressure switch on the car, that could be ur problem.