My 99 Grand Marquis went into passing gear and stayed for a while but went back to normal is this an omen transmission problems to come?


Asked by Jul 05, 2015 at 01:03 AM about the 1999 Mercury Grand Marquis 4 Dr LS Sedan

Question type: Maintenance & Repair

I'm a little worried. I have a 99 Mercury Grand Marquis LS, 168000 miles. I was driving
on the highway and noticed my temp was flickering and noticed it was in a higher gear
possibly passing and motor was revving high didn't hear immediately because windows
were open.I pulled over listening for gear changes came to a stop thinking gear
indicator on steering column was indicating wrong took off again and felt and listened
for gear changes in acceleration all was normal, all smooth gear changes no jerking
and it was fine the rest of the way home checked fluid at home it was normal and only
8000 miles on flush. It hasn't done it again since my question is this the beginning of a
possible major problem?

1 Answer


It could be. Having a high mileage transmission flushed is sometimes bad news. I would have recommended to change the transmission fluid and filter at 100,000 miles but not a flush. Parts wear over time and usage. That's normal. As wear occurs tolerances get larger and things don't work quite like they used to. The good news is the crud and junk floating around in the transmission fluid actually helps worn parts work better longer. By simply dropping the pan and changing the fluid and filter you're actually only replacing about 1/2 of the total fluid capacity. This "freshens up" the fluid and at the same time leaves enough "junk" in there for those worn parts to keep working. By flushing the fluid you make everything "squeaky clean" in there like when the transmission was new. The trouble is that the parts are worn now and without the "junk" in the fluid to grab onto the transmission won't work as well. You might try changing the filter again as it may be clogged now. But put the old fluid back in. Just top it off with new if you come up a little low. Whatever you do, don't put any additives in there. Doing that will only make things worse. The only transmission additive I recommend is TransX. I've seen it work firsthand if you follow the directions on the can to the letter. HTH. -Jim

1 out of 1 people think this is helpful.

Your Answer

Add photo

Related Questions

  • Why does my 2005 Marquis blow high heat no matter what setting I have it on? 14 answers

    My 2005 Mercury Grand Marquis had a clicking sound with the heater blowing and then it quit but now I only get really hot air blowing out. Even when I put it on A/C, Max A/C, Vent, etc. Also, changi...

    2005 Mercury Grand Marquis


    Maintenance & Repair

  • grand marquis 1 answer

    2002 grand marquis shifts in front in all gears even if you put in reverse it goes front and it does not have a reverse gear what could the problem?

    2002 Mercury Grand Marquis GS


    Maintenance & Repair

  • Why does by 1999 Grand marquis not start sometimes? 11 answers

    It has happened to me twice now, after driving in town going shopping at at a few places. Each time I had it towed to the dealer and they couldnot find anything wrong with it. It would start every t...

    1999 Mercury Grand Marquis 4 Dr LS Sedan


    Maintenance & Repair

  • 1995 Mercury Grand Marquis has no sound when trying to start. 6 answers

    We replaced the battery and the positive batt terminal on the cable as we had this prob before and it was the neg terminal bad. Cleaned everything including the ground to the body. Everything li...

    1995 Mercury Grand Marquis


    Maintenance & Repair

  • Transmission not feeling like it went into gear all the way. 2 answers

    I was idling in a parking lot for a little bit and when I wanted to leave I had to give it about 2,000rpms to get it to move. I went down the road and put it in park and back to drive and it was fi...

    2003 Jeep Grand Cherokee Laredo 4WD


    Maintenance & Repair

Search Mercury Grand Marquis Questions

Mercury Grand Marquis Experts

#1 Tracy Hooks
Tracy Hooks
Reputation 4,850
#2 kbro
Reputation 1,910
#3 Js08016
Reputation 1,440
View All

Related Models For Sale

Used Ford Crown Victoria"
11 Great Deals out of 1,654 listings starting at $1,950
Used Lincoln Town Car"
48 Great Deals out of 2,364 listings starting at $1,542
Used Chevrolet Impala"
932 Great Deals out of 35,698 listings starting at $1,500
Used Cadillac DeVille"
2,378 listings starting at $1,495
Used Ford F-150"
3,268 Great Deals out of 216,650 listings starting at $1,500
Used Honda Accord"
1,255 Great Deals out of 78,694 listings starting at $1,400
Used Ford Mustang"
731 Great Deals out of 41,065 listings starting at $900
Used Ford Taurus"
362 Great Deals out of 23,103 listings starting at $1,400
Used Toyota Camry"
1,587 Great Deals out of 98,372 listings starting at $895
Used Chevrolet Tahoe"
1,076 Great Deals out of 36,075 listings starting at $1,700

Used Cars For Sale

2011 Mercury Grand Marquis For Sale
4 Great Deals out of 44 listings starting at $4,995
2010 Mercury Grand Marquis For Sale
7 Great Deals out of 117 listings starting at $3,299
2009 Mercury Grand Marquis For Sale
5 Great Deals out of 135 listings starting at $2,995
2008 Mercury Grand Marquis For Sale
5 Great Deals out of 194 listings starting at $2,500
2007 Mercury Grand Marquis For Sale
11 Great Deals out of 199 listings starting at $1,993