The 1988 GMT-400-C2500 is a light-duty pickup truck featuring a robust chassis, powerful engine options, comfortable cab design, and versatile payload capacity. This manual covers essential information for operation, maintenance, troubleshooting, and specifications of this classic Chevrolet workhorse.
Key components: Steel body construction, independent front suspension, rear leaf springs, hydraulic brake system, and durable powertrain options.
| Feature | Description |
|---|---|
| Engine Options | 4.3L V6, 5.0L V8, 5.7L V8, 7.4L V8 |
| Transmission | 4-speed automatic, 5-speed manual |
| Payload Capacity | Up to 2,500 lbs |
| Fuel System | Electronic fuel injection (EFI) |
| Brake System | Front disc, rear drum with ABS |
| Suspension | Independent front, leaf spring rear |
| Bed Length | 6.5 ft or 8 ft options |
| Cab Configuration | Regular cab, extended cab |
| GVWR | 6,200 lbs |
| Fuel Tank | 20 or 34 gallon capacity |
Standard gauge cluster includes speedometer, fuel gauge, temperature gauge, oil pressure, and voltmeter.
WARNING! Never ignore warning lights; stop vehicle immediately if red warning lights illuminate.
Proper starting, driving, and shutdown procedures for optimal performance and longevity.
CAUTION! Always wear seat belts and ensure all passengers are properly restrained.
Regular maintenance intervals for optimal performance and reliability.
Every 3,000 miles: Oil and filter change, tire rotation, fluid level checks
Every 7,500 miles: Air filter replacement, brake inspection, chassis lubrication
Every 15,000 miles: Fuel filter replacement, cooling system service, spark plugs
Every 30,000 miles: Transmission fluid, differential fluid, brake fluid flush
Every 60,000 miles: Timing belt (if equipped), major tune-up, comprehensive inspection
Recommended fluid types and capacities for all systems.
Tip: Always use manufacturer-recommended fluids for optimal performance.
Maximum towing and payload capacities with proper equipment.
WARNING! Never exceed rated capacities; ensure proper load distribution.
12-volt negative ground system with alternator and battery specifications.
Hydraulic brake system with front disc and rear drum configuration.
CAUTION! Regular brake inspection essential for safety; replace worn components immediately.
Federal Motor Vehicle Safety Standards compliance. Features three-point seat belts, energy-absorbing steering column, side impact protection, and child safety lock provisions.
| Symptom | Possible Cause | Corrective Action |
|---|---|---|
| Engine won't start | Battery, fuel, ignition | Check battery charge, fuel level, spark plugs, ignition system |
| Poor fuel economy | Maintenance, driving habits | Replace air filter, check tire pressure, adjust driving style |
| Brake vibration | Warped rotors, worn pads | Inspect and replace brake components as needed |
| Overheating | Cooling system issues | Check coolant level, radiator, thermostat, water pump |
| Transmission slipping | Low fluid, worn components | Check fluid level and condition, service transmission |
Service: Contact authorized Chevrolet dealership for professional service and genuine parts.
Warranty: Refer to original warranty documentation for coverage details.