Manuakl Transaxle as per owners manual booklet
SAE 75W. 90 (part name)
If your transmission is manual, you will have to change gear. If it is automatic, you won't.
the synchronize in the transmission is bad, that why the jumping out of fifth gear
3,because the gear ratio in a manual transmission results is a gear ratio of about 3:1 for first gear.
Any Manual transmission can be towed with Manual Gear in Neutral; never engaged in a gear.
That manual transmission doesn't use gear oil. You can use Mercon ATF.
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.
You need a small gear puller.
Look at the gear stick, if its auto then you have an auto transmission, if its manual you have a manual transmission.
Common name for a manual transmission
Common name for a manual transmission
Top of the transmission...
Replace your transmission pump or get a new transmission.