Keep in mind the wind and the road conditions

Test the vehicle, going in both directions, on a flat road.

Front end misaligned

Adjust to specifications. Refer to Wheel Alignment Specifications in Wheel Alignment.

Unbalanced steering gear valve (if this is the cause, steering effort will be very light in the direction of lead and heavy in the opposite direction)

Replace the gear valve. Refer to Valve Replacement in Power Steering System.

Steering shaft rubbing the inside diameter of the shaft tube

Align or replace the steering column. Refer to Steering Column Replacement in Steering Wheel and Column.

Low or uneven tire pressure

Inflate the tires to the recommended pressure. Refer to Tire Inflation Description in Tires and Wheels.

Dragging front or rear brakes

Adjust the brakes.

Broken or sagging spring

Replace the spring. Refer to Front Coil Springs Replacement in Front Suspension.

Incorrect front wheel alignment (camber)

Align the front wheels. Refer to Wheel Alignment Specifications in Wheel Alignment.