Only the dealership can answer this completely, but MOST parts interchange anyplace between 1991 and 1994. These are called 'first gen explorers'.
How to change brake lines on a 1991 Buick Lesabre?
1991 ford explorer
it is located on the firewall under the brake booster
No
My 1995 Ford Explorer XLT has disk brakes front and rear , so it takes brake pads 1991 to 1994 Ford Explorers had drum brakes on the rear , so they took brake shoes
google images
No
Each brake line is held in place with a swivel nut at each end. Turn the swivel nut to the left. The brake line will come off.
The transmissions from 1991 - 1994 are the same. So the 1991 transmission will not fit a 1996 explorer.
The automatic transmission is an A4LD in a 1991 Ford Explorer
remove brake parts after removing tire should slide right off
No ( according to my Haynes Ford Explorer repair manual , 1991 to 1995 , type " F " automatic transmission fluid is used in the power steering )