The 1998 GMC line-up boasts an assortment of light trucks and vans meant to meet the challenge for hard-working transportation needs. For 1998, the GMC Yukon receives several new features such as AutoTrac four-wheel drive and rear passenger air conditioning. The 1998 GMC Yukon is only offered as a four-door model with the truck brand opting to discontinue to two-door. Exploring the 1998 GMC Jimmy in a more refined manner, the Enjoy debuts with several unique features such as high intensity discharge headlights and a Bose audio system. Misfire detection has been added to the on-broad diagnostic computer of the 6.5-liter V-8 turbocharged diesel powerplant available on the Sierra 2500 and 3500 models.