| |

1978 GMC K15 1978 Sierra Grande Cab & Chassis

Repair services & inexpensive new parts for 1978 GMC K15 1978 Sierra Grande Cab & Chassis with 6.6L 400Cu. In. V8 GAS OHV Naturally Aspirated engine.

The 1978 GMC K15 Sierra Grande Cab & Chassis is a robust, classic truck known for its powerful 6.6L 400 cubic inch V8 engine. Designed with a naturally aspirated overhead valve (OHV) configuration, this vehicle combines a rugged exterior with dependable performance, making it a popular choice for truck enthusiasts. With its 4WD capability, this two-door cab and chassis model is well-suited for both on-road and off-road adventures, although its age may require careful maintenance to ensure reliability.

Common Issues

  • Engine oil leaks due to aged gaskets
  • Carburetor issues affecting fuel efficiency
  • Suspension wear, particularly in leaf springs and shock absorbers
  • Rust, especially in the undercarriage and body panels

Maintenance Tips

  • Regularly check and replace engine oil and filters to prevent leaks
  • Inspect and clean the carburetor to maintain performance
  • Examine the suspension components periodically for wear and tear
  • Treat rust-prone areas with appropriate rust inhibitors

Typical Repair/Ownership Cost Ranges

  • Engine repairs: $500 - $2,500
  • Suspension repairs: $300 - $1,200
  • Bodywork and rust repairs: $200 - $1,500
  • Routine maintenance: $100 - $300 per service interval

Buying Advice (What to Inspect)

  • Check for engine compression and oil leaks
  • Inspect the carburetor for signs of wear or malfunction
  • Look for rust in critical areas like the frame and undercarriage
  • Evaluate the condition of the suspension and drivetrain

FAQ

  • How fuel-efficient is the 1978 GMC K15 Sierra Grande? This model is generally not fuel-efficient given its large V8 engine, averaging around 10-12 mpg.
  • Is the 1978 GMC K15 suitable for off-road driving? Yes, its 4WD capability makes it well-suited for off-road conditions.
  • What is the towing capacity of the 1978 GMC K15? The towing capacity is approximately 6,500 to 7,500 pounds, depending on the specific configuration and condition.
  • Are parts readily available for the 1978 GMC K15 Sierra Grande? Parts are generally available, especially from specialty suppliers and online marketplaces.
  • What type of oil should be used in the 6.6L V8 engine? 10W-30 conventional oil is commonly recommended for this engine.
  • Does the 1978 GMC K15 have modern safety features? No, it lacks modern safety features like airbags and ABS, common in newer vehicles.
  • How often should the transmission fluid be changed? It is advisable to change the transmission fluid every 30,000 to 50,000 miles.
  • Can the 1978 GMC K15 Sierra Grande run on unleaded gasoline? Yes, it can run on unleaded gasoline, although some owners prefer using fuel additives for older engines.

Have Questions about GMC K15 1978 Sierra Grande? Ask the assistant for questions about mileage, performance, repairs, parts, recommended maintenance and more.


Make: GMC
Model: K15
Trim: Sierra Grande Cab & Chassis 2-Door
Year: 1978

Quick Info

Fuel: GAS
Aspiration: Naturally Aspirated
Engine Displacement: 6.6L
Engine CC: N/A
Engine CID: 400
Engine Block Type: V
Cylinder Type: OHV
Cylinders: 8
Drive: 4WD
Body Type: Cab & Chassis
Doors: 2

Repair services & inexpensive new parts for 1978 GMC K15 1978 Sierra Grande Cab & Chassis with 6.6L 400Cu. In. V8 GAS OHV Naturally Aspirated engine.