I have a 1998 mercury grand Marquis with about 146,000. I get to 50-55 and have a vibration. thought it was torque converter shudder, but flushed the tranny and changed the filter to no avail. any ide

Asked by Apr 04, 2017 at 09:59 PM about the 1998 Mercury Grand Marquis 4 Dr GS Sedan

Question type: Maintenance & Repair

4 Answers

96,205

Is the CEL on? Any codes? Balanced the tires lately?

109,835

If you do have converter shutter servicing won't really help, I have had some luck using a product called Shutter Stop, you just add it to the transmission fluid, it really worked on my old Bronco, had to put some more back in after I serviced it as the shutter came back without it, was still working when it got wrecked. Advanced auto parts use to carry it.

CEL? Also, I have used shudder stop but it didn't work. I'm not sure it is shudder, but it feels like running over rumble strips.

109,835

That sounds different that converter shutter, you may have an internal pressure problem or solenoid chatter inside the tranny, have you had it too a tranny shop for any tests?

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