One problem related to power steering pump has been reported for the 1998 Chevrolet Silverado. The most recently reported issues are listed below.
The contact stated the steering was stiff and difficult to control. When the problem first occurred the service dealer said the steering would become easier to use. The steering proceeded to get worse. While traveling at higher speeds the steering became more difficult. Had the power steering pump disconnected; this did not correct the problem, but made the steering easier. The service dealer has not inspected the vehicle to determine the cause of the problem.