The new GMC Sierra full-size pickup offers multiple drivetrain configurations depending on trim level and intended use. These configurations combine different engines, transmissions, and drive systems. Let’s look at the drivetrains for the Sierra, including engine options, transmission types, rear-wheel drive and four-wheel drive systems, and key mechanical components.

Overview of Drivetrain Components

A drivetrain includes:

• Engine
• Transmission
• Transfer case (on four-wheel drive models)
• Driveshaft
• Axles and differentials

The Sierra pairs specific engines with defined transmission and drive systems.

Engine Options

The Sierra offers multiple engine types across its lineup.

2.7-Litre Turbocharged Inline-Four

Key specifications:

• Displacement: 2.7 litres
• Configuration: Inline four-cylinder
• Induction: Turbocharged
• Fuel type: Gasoline
• Output: approximately 231 kW
• Torque: approximately 583 Nm

This engine focuses on torque delivery at low engine speeds.

5.3-Litre V8

Key specifications:

• Displacement: 5.3 litres
• Configuration: V8
• Induction: Naturally aspirated
• Fuel type: Gasoline
• Output: approximately 265 kW
• Torque: approximately 519 Nm

The 5.3-litre V8 is available across multiple trims.

6.2-Litre V8

Key specifications:

• Displacement: 6.2 litres
• Configuration: V8
• Induction: Naturally aspirated
• Fuel type: Gasoline
• Output: approximately 313 kW
• Torque: approximately 624 Nm

This engine delivers the highest gasoline output in the lineup.

3.0-Litre Duramax Turbo-Diesel Inline-Six

Key specifications:

• Displacement: 3.0 litres
• Configuration: Inline six-cylinder
• Induction: Turbocharged
• Fuel type: Diesel
• Output: approximately 227 kW
• Torque: approximately 671 Nm

The diesel engine provides the highest torque figure among the available engines.

Transmission System

All Sierra engines pair with an automatic transmission.

8-Speed Automatic Transmission

• Standard with the 2.7-litre turbo engine
• Electronically controlled
• Tow/haul mode available

10-Speed Automatic Transmission

• Paired with a 5.3-litre V8 in many trims
• Standard with 6.2-litre V8
• Standard with 3.0-litre Duramax diesel
• Close gear spacing for optimized performance and efficiency

Both transmissions include electronic shift control.

Rear-Wheel Drive Configuration

Rear-wheel drive (RWD) remains available on selected trims.

Characteristics:

• Power sent to the rear axle
• Front axle free of drive components
• Lower mechanical complexity compared with four-wheel drive

Rear-wheel drive suits paved-road use and lighter-duty applications.

Four-Wheel Drive System

Four-wheel drive (4WD) appears on many trims.

Main components:

• Two-speed transfer case
• Front differential
• Front driveshaft

Driver-selectable modes include:

• 2HI (two-wheel high)
• 4HI (four-wheel high)
• 4LO (four-wheel low)

Some trims include automatic 4WD mode.

The system distributes torque to both front and rear axles for increased traction.

Transfer Case Types

Two main transfer case designs are available.

Single-Speed Transfer Case

• Found on certain entry trims
• Suitable for light off-road use
• No low-range gear reduction

Two-Speed Transfer Case

• Includes high and low ranges
• Low range supports torque multiplication
• Common on off-road-focused trims

Low range improves control during slow-speed off-road driving.

Differential Systems

The Sierra offers multiple differential configurations.

Automatic Locking Rear Differential

• Standard on many trims
• Locks rear axle under low-traction conditions

Electronic Locking Rear Differential

• Available on off-road trims
• Driver-controlled locking function

Differentials help distribute torque between wheels on the same axle.

Off-Road Drivetrain Features

Certain trims include additional drivetrain components.

Examples include:

• Skid plates
• Heavy-duty air filtration
• Off-road suspension calibration
• Hill descent control

These features complement the four-wheel drive system.

Towing and Drivetrain Integration

Drivetrain configuration affects towing capacity.

Factors include:

• Engine torque output
• Transmission gearing
• Axle ratio
• Cooling system capacity

Higher torque engines, such as the 3.0-litre diesel and 6.2-litre V8, support greater towing capability when properly equipped.

At Jenner Chevrolet, customers often compare drivetrain combinations based on towing and hauling requirements.

Axle Ratios

Axle ratio varies depending on engine and trim.

Common characteristics:

• Lower numerical ratio supports highway efficiency
• Higher numerical ratio supports towing and load handling

Axle ratio influences engine speed at given vehicle speeds.

Trailering Technologies

Drivetrain systems integrate with trailering technologies such as:

• Tow/haul mode
• Trailer sway control
• Integrated trailer brake controller

These systems rely on engine torque and transmission control to maintain stability.

Drivetrain Differences Across Trims

The Sierra lineup includes trims such as:

• Pro
• SLE
• Elevation
• SLT
• AT4
• Denali
• Denali Ultimate

Lower trims commonly pair with the 2.7-litre turbocharged engine and the 8-speed automatic transmission.
Mid- and upper-trims include V8 and diesel options with the 10-speed automatic.
AT4 trims include standard four-wheel drive with two-speed transfer case.

At Jenner Chevrolet, trim comparisons often focus on engine and drive system pairing.

Fuel Type and Drivetrain Impact

Gasoline engines include:

• 2.7-litre turbo
• 5.3-litre V8
• 6.2-litre V8

Diesel engine:

• 3.0-litre Duramax

Fuel type influences torque characteristics and driving range.

Summary of Drivetrain Offerings

The Sierra offers:

• Four engine options
• Two automatic transmissions
• Rear-wheel drive or four-wheel drive
• Single-speed or two-speed transfer case
• Automatic or electronic locking differentials

Engine selection determines transmission pairing and drivetrain capability.

Questions and Answers

How many engine options does the 2026 Sierra offer?

• It offers four engine options: a 2.7-litre turbocharged inline-four, a 5.3-litre V8, a 6.2-litre V8, and a 3.0-litre Duramax turbo-diesel inline-six.

Which transmission comes with the 6.2-litre V8?

• The 6.2-litre V8 pairs with a 10-speed automatic transmission.

Does the Sierra offer both rear-wheel drive and four-wheel drive?

• Yes. Selected trims offer rear-wheel drive, and many trims offer four-wheel drive.

What type of transfer case is available on off-road trims?

• Off-road trims commonly include a two-speed transfer case with high and low ranges.

Which engine provides the highest torque?

• The 3.0-litre Duramax turbo-diesel inline-six provides the highest torque at approximately 671 Nm.

Disclaimer: Content contained in this post is for informational purposes only and may include features and options from US or international models. Please contact the dealership for more information or to confirm vehicle, feature availability.