time for an overhaul
If it is automatic....check the cable.
A fully automatic car doesn't need any action at all to change gear, a semi automatic car can have no clutch pedal, just a gear stick which you pull backwards to gear up or pedals behind the steering wheel.
If the automatic transmission car jerks when accelerating and the dash does not indicate a gear, there is a problem with the transmission. Check the shift solenoid.
1995 Toyota Corolla automatic transmission won't go sin any gear
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That means the switch on the gearbox or lever is stuck for some reason.
the forward gear clutch pack is worn out. the only solution is to get the transmission rebult.
Because your transmission cable is broken and it must be broken near the transmission end You have to See your mechanic in transmission to replace it
your transmission is most likely shot more information is needed, year? mileage? standard or automatic?
They use a fixed, gear reduction transmission which reduces the number of rotations of the propeller from the number of rotations of the crankshift. The pilot doesn't do any shifting.
I was not aware that the Grand Marquis came in a manual Transmission! If it was an Automatic Transmission I would say take it to a Transmission Shop and have it looked at.
shift control solenoid.