The year 1998 brings subtle refinements to Chevy's one-ton truck. Passlock is added to aid in theft prevention. If someone starts the vehicle without the proper key, the engine will shut off immediately, not allowing the truck to move on its own power for 10 minutes.
The 4L60-E (light-duty) and 4L80-E (heavy-duty) electronically controlled four-speed automatic transmissions are updated to increase durability, improve gas mileage, reduce vibration (4L60-E only) and operate more smoothly overall.
Some exterior colors are replaced.