I don't think my gears are shifting, and my transmission fluid is fine, what else could it be.

Asked by Nov 22, 2014 at 02:36 AM about the 1994 Mercury Grand Marquis 4 Dr GS Sedan

Question type: Maintenance & Repair

I have a 94 mercury grand marquis,
and when I accelerate the car shakes
and it doesn't seem its going into first
gear like it should. Its an automatic.

8 Answers


Could be internal to the transmission like the torque convertor or one of your motor/trans mounts are broken. Have it looked at by a reputable mechanic.


Probably your trans, but try Lucas Xmission additive, sometimes it does miracles.Can't hurt. How long since you changed the fluid and filter?

I'm having same issue, 94 grand marquis ls, slips on occasion going 30 up to 40. Has to be first gear accelerating, going to try Lucas anti-slip today. Any thoughts on the front pump failing to create enough pressure? Fluid is still perfect full after flush and replace filter/fluid at 150ish thousand now at 161872.

My 1998 Grand Marquis slips when cold and sometimes hesitates on accelerating as fast as it should. I had fluid flushed at 83,000 miles with Merc 5 transmission fluid and now has 87,000 miles. I don't want to get rid of it, it's the rare park lane edition with the sunroof and not even at 100K miles.


Have the trans torque converter drained, the pan dropped, and new filter and fluid. Then add Best Line driveline additive, it frees valves that are stuck.

You have an email that I can message you at? I want to ask a few questions about this torque converter. The shop just dropped the pan and charged me 200$ bucks for the flush with new filter and the mentioned merc IV fluid


I'm afraid I'd get too many emails from other people. The converter has a drain plug behind a rubber cork at the bottom of the bell housing.(other cars don') It does need mercon fluid, but the converter holds more fluid than the trans, and it's important to drain it. Try the additive first (from Amazon). My Merc Van started shifting right after 12 years of not, just adding 1/4 bottle of Best Line.

1 of 1 people found this helpful.

OK thanks will definitely try it. Can't hurt to try after all I have 2 Grand marquis lol both very low miles.so I'll take the chance on this one.

Your Answer

Grand Marquis

Looking for a Used Grand Marquis in your area?

CarGurus has 1,735 nationwide Grand Marquis listings starting at $1,000.


Mercury Grand Marquis Experts

  • #1
    Tracy Hooks
  • #2
  • #3
View All

Related Models For Sale

Used Lincoln Town Car
50 Great Deals out of 1,765 listings starting at $1,000
Used Ford Crown Victoria
4 Great Deals out of 1,191 listings starting at $1,496
Used Chevrolet Impala
537 Great Deals out of 35,320 listings starting at $900
Used Ford F-150
2,606 Great Deals out of 198,114 listings starting at $1,300
Used Ford Mustang
593 Great Deals out of 36,397 listings starting at $1,200
Used Chevrolet Tahoe
744 Great Deals out of 41,784 listings starting at $1,995
Used Cadillac DeVille
1,562 listings starting at $2,995
Used Lincoln Continental
17 Great Deals out of 3,880 listings starting at $35,890
Used Chevrolet Caprice
201 listings starting at $9,995
Used Ford Taurus
192 Great Deals out of 15,922 listings starting at $1,850
Used Buick LeSabre
17 Great Deals out of 1,766 listings starting at $1,000

Used Cars For Sale

2011 Mercury Grand Marquis For Sale
23 listings starting at $5,450
2010 Mercury Grand Marquis For Sale
4 Great Deals out of 93 listings starting at $4,795
2009 Mercury Grand Marquis For Sale
7 Great Deals out of 88 listings starting at $2,599
2008 Mercury Grand Marquis For Sale
8 Great Deals out of 152 listings starting at $2,790
2007 Mercury Grand Marquis For Sale
8 Great Deals out of 130 listings starting at $1,995

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.