1999 GMC T7500

Introduction:

The 1999 GMC T7500 is a heavy-duty pickup truck powered by a 7.4L Vortec V8 engine that produces 290 horsepower and 410 lb-ft of torque. It is available with a variety of transmission options, including a 6-speed manual, a 4-speed automatic, and a 5-speed Allison automatic. People appreciate the T7500’s powerful engine, rugged construction, and spacious cabin. However, some owners have reported issues with various components of the vehicle.

Engine

7.4L Vortec V8

• Intake Manifold Gasket Failure:
  • Description/Symptoms: Coolant or oil leaking from the intake manifold, rough idle, poor engine performance
  • Solution: Replace intake manifold gasket
  • Estimated Cost to Fix: $400 - $600
  • Recalls: None Found
• Valve Cover Gasket Leak:
  • Description/Symptoms: Oil leaking from valve cover, burning oil smell
  • Solution: Replace valve cover gasket
  • Estimated Cost to Fix: $200 - $400
  • Recalls: None Found
• Exhaust Manifold Crack:
  • Description/Symptoms: Loud exhaust noise, loss of power
  • Solution: Replace exhaust manifold
  • Estimated Cost to Fix: $500 - $800
  • Recalls: None Found

Transmission

6-Speed Manual

• Clutch Failure:
  • Description/Symptoms: Difficulty shifting gears, slipping clutch
  • Solution: Replace clutch
  • Estimated Cost to Fix: $1,200 - $1,800
  • Recalls: None Found
• Transmission Noise:
  • Description/Symptoms: Grinding or whining noise when shifting gears
  • Solution: Diagnose and repair transmission as needed
  • Estimated Cost to Fix: $800 - $2,000
  • Recalls: None Found

4-Speed Automatic

• Slipping Gears:
  • Description/Symptoms: Transmission slips out of gear, difficulty shifting
  • Solution: Replace transmission
  • Estimated Cost to Fix: $2,500 - $3,500
  • Recalls: None Found

5-Speed Allison Automatic

• Torque Converter Failure:
  • Description/Symptoms: Shuddering or slipping during gear changes
  • Solution: Replace torque converter
  • Estimated Cost to Fix: $1,000 - $1,500
  • Recalls: None Found

Suspension

• Leaf Spring Breakage:
  • Description/Symptoms: Broken leaf spring, sagging suspension
  • Solution: Replace leaf springs
  • Estimated Cost to Fix: $400 - $800
  • Recalls: None Found

Electrical

• Alternator Failure:
  • Description/Symptoms: Battery not charging, electrical problems
  • Solution: Replace alternator
  • Estimated Cost to Fix: $300 - $500
  • Recalls: None Found

Exterior

• Headlight Switch Failure:
  • Description/Symptoms: Headlights not working, intermittent flickering
  • Solution: Replace headlight switch
  • Estimated Cost to Fix: $200 - $400
  • Recalls: None Found

Interior

• Dashboard Lights Malfunctioning:
  • Description/Symptoms: Dashboard lights not working or inaccurate readings
  • Solution: Repair or replace faulty wiring or sensors
  • Estimated Cost to Fix: $200 - $500
  • Recalls: None Found
• Seat Heater Failure:
  • Description/Symptoms: Seat heater not working properly or overheating
  • Solution: Replace seat heater element
  • Estimated Cost to Fix: $300 - $500
  • Recalls: None Found

Summary:

The 1999 GMC T7500 is a reliable and capable heavy-duty pickup truck. However, like any vehicle, it has its share of potential issues. The most common problems reported by owners include engine gasket leaks, clutch failure, transmission noise, and suspension issues. The severity and cost of these issues vary, but it is important to be aware of them when considering purchasing or maintaining a T7500.