The GMC Sierra Pickup Truck, produced from 1988 to 1998 on the GMT400 platform, is a full-size pickup truck renowned for its robust construction, significant towing and payload capacities, and versatile utility. Available in Regular Cab and Extended Cab configurations with various wheelbase options, it offered a range of powerful engine choices, including the 4.3L V6 and V8 options such as the 5.0L, 5.7L, and 7.4L Vortec engines. Its durable chassis, strong V8 engine options, and available 4x4 systems made it a staple in the American automotive landscape, capable of handling demanding tasks and serving as a reliable workhorse.

This comprehensive factory service and repair workshop manual provides detailed information for maintaining, diagnosing, and repairing your 1988-1998 GMC Sierra Pickup Truck. Covering all major systems, including engines (4.3L V6, 5.0L V8, 5.7L V8, 7.4L V8), transmissions (4L60E, 4L80E, NV3500, NV4500), drivetrain, suspension, steering, brakes, electrical systems, and bodywork, this manual offers in-depth procedures. It includes routine maintenance schedules, troubleshooting guides, diagnostic steps for OBD-I and early OBD-II systems, component overhaul instructions, and critical technical specifications, empowering owners and technicians to keep their Sierra in optimal condition.