If it was a problem with the strut bearings I would think it would do it consistant left or right. Sounds to me like a fault in the rack & pinion. Fluid may not be being directed properly in the rack to provide assist when your turning right. There are valves in the rack that control the flow of fluid inside the rack to provide proper assist. Most remanufactured rack & pinions come with new inner tie rods, you can either swap over your outers or get new outer tie rods as well. You will also need an alignment when done. If you count the amount of rotations it takes to remove the outer tie rods off the old rack and install same amount on new rack alignment will be close enough that you should be able to drive her to the nearest alignment shop. Make sure you flush all the old fluid out of the system and if the pump is whiny at all replace it too.
BUILT FORD TOUGH