2002 grand marquis shifts in front in all gears even if you put in reverse it goes front and it does not have a reverse gear what could the problem?
Quite a number of things, the reverse solenoid is inoperative, the TCM is not sending a reverse signal to the solenoid, reverse band maybe broke. Are you getting any transmission codes?
1993-1997parts ,engines4.6ltr. some interchange parts.hope it helps