As of 2015, a 1998 Chevrolet 1500 in good condition is worth about $2000, according to Kelly Blue Book. If the truck is in excellent condition, it is worth about $2,600.
There are several makes and models of the Chevy 1500. A 1998 Chevrolet 1500 with an extended cab in excellent condition is worth about $3,403 as of 2015. In good condition, the Kelly Blue Book values this model at $2,700.
The value of the truck may go up or down depending on the mileage and the additional features included with the truck. A Chevy 1500 with fewer miles, for example, has a higher resell value than a truck with more miles.