Mercury Grand Marquis owners have reported 1 problem related to transmission gear slipping (under the power train category). The most recently reported issues are listed below. Also please check out the statistics and reliability analysis of Mercury Grand Marquis based on all problems reported for the Grand Marquis.
Transmission slipped and shuttered on incline at 10 mph. Yh.
See
all problems of the 1998 Mercury Grand Marquis
🔎.