Eagle premier 1989 3.0 LTR lx model

I HAVE AN EAGLE GIVING ME A FIT !!! REVERSE GEAR HAS FAILED IT HAS THE FOUR SPEED AUTOMATIC TRANS ,REVERSE USED TO TAKE SOME TIME BEFORE IT WOULD ENGAGE, YOU COULD FEEL IT ENGAGE IT NEVER SLIPPED ONCE IT HOOKED UP DOES ANY ONE KNOW ABOUT THESE BASTARD CARS ???