I had a 91 Explorer 5-speed at one time, and I never had a problem with the 5-speed, nor have heard of a common problem with them. I think someone would be more concerned about the automatic transmission.. My advice, go and test drive it, run it through the gears, see how the feel and engage.. if all is good then it should be fine especially with some fresh synthetic tranny fluid, that should prolong the life of it even longer..
1990 Ford Probe LX 3.0L V6 :s6:
SEE IT HERE:
1989 Mazda RX-7 Turbo II 13B-T "FC3S"
Turbo RWD Rotary Powa!