2000 GMC B7

The 2000 GMC B7 is a chassis used for various commercial applications, primarily buses and recreational vehicles. This chassis was popular due to its robust construction and suitability for heavy-duty use. Engine options included the 6.5L Turbo Diesel V8, producing around 190-215 horsepower and 385-440 lb-ft of torque, as well as gasoline options like the 7.4L (454 cu in) V8. Owners appreciate the B7’s reliability and suitability for customization, but commonly complain about fuel economy and age-related maintenance.

Engine

6.5L Turbo Diesel V8

• Cracked Cylinder Heads
  • Description/Symptoms: Overheating, coolant loss, white smoke from the exhaust.
  • Solution: Replace cylinder heads.
  • Estimated Cost to Fix: $2,000 - $4,000+
  • Recalls: None Found
• Fuel Injector Failure
  • Description/Symptoms: Rough running engine, poor fuel economy, black smoke.
  • Solution: Replace faulty fuel injectors.
  • Estimated Cost to Fix: $300 - $800+
  • Recalls: None Found
• PMD (Pump Mounted Driver) Failure
  • Description/Symptoms: Sudden stalling, no start condition, intermittent engine performance issues. The PMD controls the fuel injection pump. It is mounted to the side of the injection pump.
  • Solution: Replace the PMD and relocate it away from the engine to reduce heat exposure. Install a PMD relocation kit.
  • Estimated Cost to Fix: $200 - $500+
  • Recalls: None Found

7.4L (454 cu in) V8

• Oil Leaks
  • Description/Symptoms: Oil spots under the vehicle, burning oil smell, low oil level. Common leak areas include the valve cover gaskets, oil pan gasket, and rear main seal.
  • Solution: Replace leaking gaskets and seals.
  • Estimated Cost to Fix: $100 - $500+ per leak
  • Recalls: None Found
• EGR Valve Issues
  • Description/Symptoms: Rough idle, poor performance, check engine light (EGR code).
  • Solution: Replace the EGR valve.
  • Estimated Cost to Fix: $150 - $350+
  • Recalls: None Found

Transmission

Allison Automatic (Specific model number varies based on application)

• Shift Problems
  • Description/Symptoms: Harsh shifting, slipping between gears, failure to shift, transmission overheating. Can be caused by worn clutches, valve body issues, or solenoid problems.
  • Solution: Perform transmission service, repair or replace valve body, replace worn clutches, or overhaul the transmission.
  • Estimated Cost to Fix: $300 - $3,000+ (depending on severity)
  • Recalls: None Found
• Torque Converter Failure
  • Description/Symptoms: Shuddering, stalling, poor acceleration, transmission overheating.
  • Solution: Replace the torque converter.
  • Estimated Cost to Fix: $500 - $1,500+
  • Recalls: None Found

Suspension

• Leaf Spring Sagging/Failure
  • Description/Symptoms: Vehicle sagging on one side, poor ride quality, decreased load-carrying capacity. This is common due to the heavy loads these chassis often carry.
  • Solution: Replace leaf springs.
  • Estimated Cost to Fix: $500 - $1,500+ per axle
  • Recalls: None Found
• Worn Ball Joints/Tie Rod Ends
  • Description/Symptoms: Loose steering, clunking noises from the front end, uneven tire wear.
  • Solution: Replace worn ball joints and/or tie rod ends.
  • Estimated Cost to Fix: $200 - $600+ per side
  • Recalls: None Found

Electrical

• Wiring Harness Issues
  • Description/Symptoms: Intermittent electrical problems, short circuits, lights flickering, gauges malfunctioning. Rodent damage or corrosion can cause this.
  • Solution: Repair or replace damaged sections of the wiring harness.
  • Estimated Cost to Fix: $100 - $1,000+ (depending on severity)
  • Recalls: None Found
• Alternator Failure
  • Description/Symptoms: Dimming lights, dead battery, warning lights on the dashboard.
  • Solution: Replace the alternator.
  • Estimated Cost to Fix: $200 - $500+
  • Recalls: None Found

Exterior

• Rust
  • Description/Symptoms: Rusting of the frame and body panels. Especially prevalent in areas with road salt.
  • Solution: Repair or replace rusted panels, treat with rust inhibitor.
  • Estimated Cost to Fix: $100 - $1,000+ (depending on severity)
  • Recalls: None Found
• Weather Stripping Deterioration
  • Description/Symptoms: Leaks around windows and doors.
  • Solution: Replace the worn weather stripping.
  • Estimated Cost to Fix: $50 - $300+ (depending on severity)
  • Recalls: None Found

Interior

• HVAC Fan Motor Failure
  • Description/Symptoms: Blower motor not working, only working on certain speeds.
  • Solution: Replace the blower motor or blower motor resistor.
  • Estimated Cost to Fix: $100 - $300+
  • Recalls: None Found
• Dashboard Cracks
  • Description/Symptoms: Cracks in the dashboard plastic.
  • Solution: Replace dashboard or install a dashboard cover.
  • Estimated Cost to Fix: $50 - $1,000+
  • Recalls: None Found

Summary

The 2000 GMC B7 chassis, while robust, is prone to several issues due to its age and heavy-duty application. Engine problems like cracked cylinder heads and fuel injector failures in the diesel, and oil leaks in the gasoline engines can be costly. Transmission issues can also require significant repairs. Suspension and electrical problems are also common. The severity and cost of these issues vary greatly depending on the condition of the specific vehicle. Rust can be a significant concern, especially in certain regions. Prospective buyers should carefully inspect these areas and factor in potential repair costs.