1991 GMC C3500HD
Introduction: The 1991 GMC C3500HD is a heavy-duty pickup truck known for its ruggedness and hauling capabilities. It is powered by a 7.4L V8 engine paired with a 4-speed automatic transmission or a 5-speed manual transmission. The C3500HD is renowned for its high torque but is criticized for its poor fuel economy and lack of modern features.
Engine
- 7.4L V8 with 4-speed Automatic Transmission
- Intake Manifold Gasket Failure: Leaks coolant and causes overheating. Requires replacement of the manifold gasket. $300 - $500+
- Head Gasket Failure: Blows out, causing coolant and oil mixing. Requires head gasket replacement and possible cylinder head resurfacing. $1200 - $2500+
- 7.4L V8 with 5-speed Manual Transmission
- Throttle Position Sensor Malfunction: Causes erratic engine performance and stalling. Requires TPS replacement. $150- $250+
Transmission
- 4-speed Automatic Transmission
- Torque Converter Shudder: Vibrations felt during acceleration. Requires torque converter replacement. $1000 - $1500+
- Shift Solenoid Failure: Transmission shifts erratically or refuses to shift. Requires solenoid replacement. $200 - $400+
- 5-speed Manual Transmission
- Clutch Failure: Slipping or shuddering during engagement. Requires clutch replacement. $500 - $800+
Suspension * Leaf Spring Breakage: Occurs due to heavy loads or road damage. Requires leaf spring replacement. $600 - $1000+ per axle
Electrical * Alternator Failure: No charging of the battery. Requires alternator replacement. $300 - $600+
Exterior * Tailgate Corrosion: Rusting and pitting occur at the bottom of the tailgate. Requires tailgate replacement or repair. $500 - $1200+
Interior
- Heater/AC Blower Motor Failure: No air flow from vents. Requires blower motor replacement. $200 - $400+
Summary: The 1991 GMC C3500HD is a reliable workhorse with known engine and transmission issues. While the repairs can be costly, the vehicle’s durability and towing capacity make it a popular choice for heavy-duty applications. Owners should be prepared for potential repairs, especially as the vehicle ages.