Problems with 2005 Nissan Armada STEERING

The first incident took place approximately 1 year after purchase, but it was not as severe, so i will begin with the first severe occurrence, which took place in the summer of 2009. at about 55 miles per hour the vehicle shakes, and the steering seemed a bit loose. but because i like my nissan, i just drove it very carefully. then in 2014, it became almost impossible to control. i began to research problems that others were having as originally i thought the problem i was having was related to the brake system. but it was shaking even without applying the brakes. i have owned vehicles that cost considerably less, and i have never had a problem where the steering shaft connection to the rack and pinion assembly became so worn that both the steering shaft and the rack and pinion assembly had to be replaced. this seems to be an engineering defect or poor workmanship, and a definite safety hazard, and if i had not had the presence of mind to have it checked out, or the finances to have it repaired, it would certainly have resulted in a car crash and possible loss of life, as when the steering started to degrade without my applying the brakes, it degraded quite rapidly. i paid auto-nation nissan of memphis $1989.60 to repair, and it only put me back to the point where the shuddering or shaking only occurs when i apply the brakes. i would not be able in good conscious to sale this vehicle to anyone, though i am sure that north american nissan would have no problem doing so. *tr

Purchased a 2005 nissan armada in december 2004. noticeable shaking in steering wheel column when braking. this usually occurs when braking from speeds greater than 40 mph. took the car to the dealer where i purchased it from and they acknowledged that there has been an issue with steering wheel shaking, which the service advisor explained, is due to rotor becoming heated and warped. he said that they have a temporary fix for the problem - changing brake pads, rotors, and installing a bolt somehwere, and that nissan was working on a permanent fix. i wish i new about this issue before i dished out the big bucks. hopefully, this problem does not pose a deadly hazard in the not to distant future.*ak