1991 GMC B6000

Introduction:

The 1991 GMC B6000 is a heavy-duty pickup truck that was offered with a variety of engine and transmission options. The standard engine was a 350 cubic-inch V8 with 210 horsepower and 300 lb-ft of torque, but a larger 454 cubic-inch V8 with 230 horsepower and 385 lb-ft of torque was also available. Transmission options included a 4-speed manual, a 5-speed manual, and a 4-speed automatic. The B6000 was praised for its powerful engines, rugged construction, and towing capabilities, but it was criticized for its poor fuel economy and lack of modern amenities.

Engine

350 cubic-inch V8

• Intake Manifold Gasket Failure:
  • Description/Symptoms: Coolant leak, engine overheating, rough idle
  • Solution: Replace intake manifold gasket
  • Estimated Cost to Fix: $200 - $500
  • Recalls: None Found
• Valve Stem Seal Failure:
  • Description/Symptoms: Excessive oil consumption, blue smoke from exhaust, fouled spark plugs
  • Solution: Replace valve stem seals
  • Estimated Cost to Fix: $600 - $1,000
  • Recalls: None Found

454 cubic-inch V8

• Cylinder Head Gasket Failure:
  • Description/Symptoms: Coolant leak, engine overheating, white smoke from exhaust
  • Solution: Replace cylinder head gasket
  • Estimated Cost to Fix: $1,000 - $1,500
  • Recalls: None Found
• Transmission

4-Speed Manual

• Synchronizer Failure:
  • Description/Symptoms: Difficulty shifting gears, grinding noise
  • Solution: Replace synchronizers
  • Estimated Cost to Fix: $500 - $700
  • Recalls: None Found

5-Speed Manual

• Input Shaft Bearing Failure:
  • Description/Symptoms: Noise from transmission, loss of power
  • Solution: Replace input shaft bearing
  • Estimated Cost to Fix: $500 - $700
  • Recalls: None Found

4-Speed Automatic

• Torque Converter Failure:
  • Description/Symptoms: Slipping gears, shuddering
  • Solution: Replace torque converter
  • Estimated Cost to Fix: $800 - $1,200
  • Recalls: None Found

Suspension

• Leaf Spring Failure:
  • Description/Symptoms: Sagging springs, loss of ride height
  • Solution: Replace leaf springs
  • Estimated Cost to Fix: $400 - $700
  • Recalls: None Found

Electrical

• Alternator Failure:
  • Description/Symptoms: Dim headlights, battery not charging, warning light on dashboard
  • Solution: Replace alternator
  • Estimated Cost to Fix: $300 - $500
  • Recalls: None Found
• Starter Failure:
  • Description/Symptoms: Engine cranks slowly or not at all
  • Solution: Replace starter
  • Estimated Cost to Fix: $200 - $300
  • Recalls: None Found

Exterior

• Rust:
  • Description/Symptoms: Rust spots on body panels, frame, and other components
  • Solution: Repair or replace affected parts
  • Estimated Cost to Fix: Varies depending on severity
  • Recalls: None Found

Interior

• HVAC Blower Motor Failure:
  • Description/Symptoms: No air flow from vents
  • Solution: Replace blower motor
  • Estimated Cost to Fix: $100 - $200
  • Recalls: None Found

Summary

The 1991 GMC B6000 is a rugged and powerful pickup truck, but it is not without its issues. The most common problems include intake manifold gasket failure, valve stem seal failure, cylinder head gasket failure, transmission problems, and rust. The severity of these issues can vary depending on the specific engine and transmission option, and the cost of repairs can range from a few hundred dollars to over $1,500. Potential buyers should be aware of these potential issues before purchasing a used B6000.