One problem related to steering gear box has been reported for the 1999 Mercury Grand Marquis. The most recently reported issues are listed below.
I have been having problems with 'dead' spot in my steering, causing me to oversteer. I took the car to a goodyear service where they adjusted some part on the gear box. This helped, but continued to oversteer the vehicle. I returned to the shop again and purchased four (4) new tires, aligned the front end all all four wheels. Again the adjusted the gear box due to my complaint. I drove over to sarasota where I was not satisfied with the way the car was steering and I returned to another goodyear store where I was advised the gear box is 'condemned' and has to be replaced. My car now 'wanders' all over the road and I must fight to control the vehicle in a straight line. I have owned many cars over the years and have talked to several mechanics who advised me that this is not common and must be a defective gear box installed on the vehicle. I feel Mercury should replace the gear box at their expense, not mine as this is a safety feature that should not occur. Mr.