How long does it take to drop the transmission in a 1993 mecury sable 3 .8 liter

have the fault codes read
indicates a problem torque converter clutch servo/ solenoid problem
check transmission oil level if there is a dipstick

Vacuum drops --you got leaks

The codes are mostly oxygen sensors
most likely from leaks

check your tranny fluid make sure its got enough

normally hard to get at but near where your speed cable attaches to your transmission

Drop the tank or might be trap door under the carpet by back seat

May have blown the fuse or connections to alternator may be poor.

Look carefully on the tire itself. The max pressure WILL be stamped into the tire side wall. You then choose how close to max pressure you want to run. heavy load ?? Max pressure. Normal load a few pounds below max.
Note ---- The closer you run to max the better your fuel mileage. You will get a "stiffer ride" with max. You will feel the bumps more.

inside the transmission oil pan

JUST GET THE IGNITION KEY REMADE

check the coil and spark plug wires