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1999 GMC W5500 Forward

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By Research the Car 2 min read

Introduction:

The 1999 GMC W5500 Forward is a heavy-duty work truck with a powerful V8 engine. It boasts 340 horsepower and 454 lb-ft of torque, providing ample power for towing and hauling. The truck is appreciated for its impressive towing capacity, durability, and spacious cab. However, it has been reported to have several issues that can affect its performance and reliability.

Engine

6.0L Vortec V8

  • Intake Manifold Gasket Failure: Symptoms include coolant leaks, overheating, and rough idling. This issue can be caused by a defective intake manifold gasket that allows coolant to leak into the cylinders. Solution involves replacing the gasket, thermostat, and coolant. Estimated cost to fix: $500-$900
  • Fuel Injector Problems: Symptoms include reduced engine power, poor acceleration, and increased fuel consumption. This issue can be caused by clogged or faulty fuel injectors. Solution involves cleaning or replacing the fuel injectors. Estimated cost to fix: $300-$600

Transmission

  • 4L80E Automatic Transmission:

  • Transmission Slipping: Symptoms include difficulty shifting gears, erratic transmission behavior, and loss of power. This issue can be caused by worn clutches, a faulty torque converter, or a damaged transmission control module (TCM). Solution involves rebuilding or replacing the transmission or repairing the TCM. Estimated cost to fix: $1,500-$3,000

Suspension

  • Leaf Spring Breakage: Symptoms include a sagging rear end, uneven tire wear, and a rough ride. This issue can be caused by overloaded or rusted leaf springs. Solution involves replacing the broken leaf springs. Estimated cost to fix: $400-$800
  • Shock Absorber Failure: Symptoms include a bouncy ride, poor handling, and premature tire wear. This issue can be caused by worn or damaged shock absorbers. Solution involves replacing the shock absorbers. Estimated cost to fix: $200-$400

Electrical

  • Alternator Failure: Symptoms include a dead battery, flickering lights, and electrical system malfunctions. This issue can be caused by a faulty alternator that is unable to generate electricity. Solution involves replacing the alternator. Estimated cost to fix: $300-$600
  • Battery Drain: Symptoms include a dead battery even after charging. This issue can be caused by a parasitic draw on the battery from a faulty component or accessory. Solution involves identifying and repairing the source of the drain. Estimated cost to fix: $100-$300

Exterior

  • Rust on Body Panels: Symptoms include visible rust spots, peeling paint, and structural weakening. This issue can be caused by exposure to moisture and salt. Solution involves sanding, body repair, and rustproofing. Estimated cost to fix: $500-$2,000

Interior

  • HVAC Blower Motor Failure: Symptoms include lack of air flow from the vents. This issue can be caused by a faulty blower motor or a clogged filter. Solution involves replacing the blower motor or cleaning the filter. Estimated cost to fix: $150-$300

Summary:

The 1999 GMC W5500 Forward has been known to experience a range of issues that can affect its performance and reliability. While some of these issues are relatively minor and inexpensive to repair, others can be more severe and costly. Owners should be aware of these potential issues and take preventative measures to minimize their occurrence.

GMC, W5500 Forward
GMC W5500 Forward 1999
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