1999 Grand Marques Trans Service

2 posts 2 contributors 2,075 views

Member since Sep 2013
1 post
Salisbury, NC, USA
1 vehicle in the registry

Sep 18, 2013 at 1:00 PM

I have a 1999 Mercury Grand Marquis LS. 91k
It has air ride and performance suspension.
There is a sound like you are running over rumble strips every now and then.
Reading on forums it sounds like it is a transmission issue.
I am looking into having the transmission fluids changed since I do not know
if it has ever been changed since I just purchased it. The question is
should I have it flushed or should the pan be dropped and the torque converter drained also?

jdmeaux

Member since Jan 2009
525 posts
Lafayette, LA, USA
1 vehicle in the registry

Sep 18, 2013 at 1:02 PM

An automatic transmission should be serviced between 15-20K miles, pulling the pan and draining the converter.

*******************
PROUD MEMBER of www.crownvic.net

It's just a SUPER-DUTY Mustang GT Sedan. 198K miles and still rolling HARD.

1997 Crown Victoria P71 SVT *** ex-US Marshall service (the CAR)
STOCK?? I bet it was modified.

13.26 @ 107.24 MPH 1/4 mi w/ me, tools, & full tank of 93 octane

I added CAI, NICHE 19 X 8.5 " wheels with 245/45ZR 19 rubbers, and completely rebuilt the front end with poly bushings, Kooks headers, 2 1/4inch exhaust, TCI 2200-2400 rpm Stall converter

.PLANS:: engine upgrade, 5.4L 2v stroker, rebuild interior in leather w/ buckets, thinking about turbos

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