"Other key platform components found on every Armada include engine speed-sensitive power-assisted rack-and-pinion steering and 4-wheel disc brakes with Bosch Anti-lock Braking System (ABS) with Electronic Brake force Distribution (EBD), Vehicle Dynamic Control (VDC) system with Traction Control and Tire Pressure Monitor System (TPMS)."
Yeah, I think I might be having the same problem. It's a weird feeling in the steering. These ArmadaS run on a single serpentine belt which if loose, can affect a variety of functions including steering and handling. I will check my tire pressures and hard turning radiuses. If it still feels funky I will have Nissan Service check it out. I also pick up a slight vibration on the driver side front wheel which Nissan Service instantly replaced the entire braking system with the '06 Bosh Rotors and pads, no questions asked. I have a new '05 SE 4x4 with only 1300 miles and was surprised to find any quriks for concern. If you get a specific fix for your vehicle control concerns, let me know as I will do the same if a service is performed.