Brakes locked?
No ( motorcraft . com shows the 1995 Grand Marquis transmission as an AOD - E and the 1997 Grand Marquis transmission as a 4R70W and different part numbers )
yes
no
my 1990 mercury marquis transmission is slipping in overdrive what do i need to look for and how can i fix it
Transmission
Your 1996 Mercury Grand Marquis may need a new transmission or something as simple as transmission fluid.
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.
take it to a shop
on the transmission
There is no dipstick. It is a matenance free trans.
gas
Rear of engine near firewall.