Depending on the mileage, a 1998 Ranger that still runs and looks great would be worth anywhere from $1900-3500$. If it's excellent with very low miles, possibly up to $5800.
What is the specific trim? If it is a flareside splash it would be $1,475. The styleside supercab would be $4,825. It all depends on how many miles you have and what style.