Dave see my last post on "Alignment specialist confirms". I had weird issues like yours.
I called the tech line of Firm Feel describing the issue with my steering box on the Duster. The tech said that this is a common condition and can be easily corrected. Remove the top centering valve (two bolts and the hose connections). Disassemble and clean the internal components. If there is any debris in the bore, the piston will not move freely which caused my issue. Turn right, and it wants to keep turning right, turn left and it wants to keep turning left. Lazy to no return to center (straight) when driving. I first marked the placement of the centering valve with a silver Sharpie to aid in getting the reassembly position correct. I then removed the centering valve, disassembled the valve removing the piston and shot the bore with Berryman B12 chemtool spray. The bore of my centering valve had some junk that looked like liquid rust and a few pieces of possibly rubber-like chunks. I ran a brass cleaning brush in and out of the bore. I used a piece of crocus cloth wrapped around my little finger in the bore to remove any burs or other FOD (for you aerospace folks). Reassembled the centering valve, cleaned up the mounting area on top of the power steering box. Crossed my fingers. Said a prayer to the steering gods. Fired up the 340 and YES!! Wheel stayed straight. Took the car for a test drive and we are a happy camper now.
I hope this can help someone else who is having this or similar issue with their steering box. Big thanks to the techs at Firm Feel INC.
