Remove the drive shaft, and pry out the old seal. Tap in the new seal very carefully. Best to have the right tool for this.
Replace the shocks, or struts if equipped.
yes
Remove the wing nuts from inside the trunk. Just pull the housing out after.
Not that I know of , just rear wheel drive on a Mercury Grand Marquis from the factory
on a 1997 Mercury Grand Marquis kill switch be activated by a rear end collision
On a 2001 Mercury Grand Marquis : The fuel tank is mounted vertically behind the rear seat
the tire pressure for most Grand Marquis models is 31 psi front, 35 psi rear.
with tools
It's built into the rear windshield.
I believe they are 8" by 9"
rear wheel drive
Rear of engine near firewall.