T-Series

This GMC medium-duty nameplate was introduced for the 1998 model year as the brand’s low-cab-forward commercial truck line in North America. It replaced GMC’s earlier forward-control medium-duty offering and was closely related to General Motors’ joint-venture Isuzu commercial-truck program, using Isuzu-derived cab architecture paired with GMC badging and GM-specific applications. The line was positioned as a work-focused chassis for vocational buyers rather than as a consumer vehicle, and it was sold in several weight-rated versions over its life, with model designations such as 6500, 7500, and 8500 used to identify the class. In GMC’s medium-duty lineup, it sat alongside the company’s conventional-cab trucks and served customers who needed a compact cab-over layout for visibility and maneuverability in tight urban or delivery environments. Through the 2000s, the truck remained part of GMC’s commercial portfolio while receiving ongoing updates to powertrain and equipment availability as emissions and duty-cycle requirements evolved. The nameplate ended after the 2009 model year, when GMC withdrew from this cab-over medium-duty segment. It is remembered as one of GMC’s more specialized commercial offerings, reflecting the period when General Motors and Isuzu shared technology and model strategy in North American medium-duty trucks.