6.0L LY6 V8 Engine with 4L70E Automatic Transmission Turnkey Package

6.0L LY6 Engine with 4L70E Transmission for Sale. Complete GM V8 Turnkey Package.

The 6.0L LY6 engine with 4L70E transmission is one of the most capable and cost-effective drivetrain combinations available in the used GM truck market. If you are building a swap project, replacing a worn drivetrain in a work truck or SUV, or looking for a matched engine and transmission package with real towing and hauling capability, the LY6 6.0 engine turnkey package is a proven starting point. At McClain Auto Part, we have been sourcing and selling used GM drivetrains out of Cleveland, Ohio since 2009. The GM 6.0 V8 engine and transmission combo is one of the most consistent packages we carry.

Builders and truck owners come to us for this combination for straightforward reasons. Some need a direct factory replacement for a heavy duty GM truck or van that has developed internal engine or transmission failure. Others are doing a swap project into a C10, a first gen Suburban, a custom chassis, or a diesel-to-gas conversion where the LY6 6.0 offers more displacement and torque than a 5.3L platform. A smaller group is building a dedicated tow rig or work truck where output and transmission durability matter more than fuel economy.

Whatever the application, the goal is the same. A tested, matched 6.0 LY6 swap package that installs together and runs correctly from day one.

Key Features

• 6.0L LY6 V8 engine, OEM GM iron block truck engine
• 4L70E automatic transmission, matched from the same donor vehicle
• Low mileage assembly, verified from donor vehicle records
• Compression tested on all eight cylinders before shipping, numbers recorded
• Full visual inspection completed at our Cleveland facility
• Transmission inspected for leaks, case condition, and external damage
• Oil condition and coolant passages checked before packaging
• 6-month warranty against internal mechanical defects on engine and transmission
• Ships freight to all 50 states from Cleveland, Ohio
• Most orders processed within 1 to 3 business days

Why the LY6 and 4L70E Combination

The LY6 is a 6.0L Gen IV V8 that GM used primarily in heavy duty truck and van applications. It shares the basic Gen IV LS architecture with the 5.3L engines found in lighter duty trucks and SUVs. However, the LY6 uses an iron block rather than aluminum, displacement is 6.0L rather than 5.3L, and the engine is tuned for low end torque and durability in demanding applications. These differences make the LY6 a better fit than the 5.3L for towing builds, work trucks, and applications where sustained load capacity matters.

The Iron Block Advantage

The iron block on the LY6 is a point that matters for certain applications. Aluminum block engines are lighter and thermally efficient, which makes them a good choice for daily-driven street builds. The iron block on the LY6 is heavier but more dimensionally stable under sustained heat and load cycles. For tow rigs, work trucks, diesel-to-gas conversions, and applications where the engine will spend extended time under load, the iron block holds up well over time.

The 4L70E Transmission

The 4L70E is a heavy duty variant of the 4L65E, which itself is a strengthened version of the 4L60E. Each step in that progression adds internal capacity. The 4L70E uses stronger planetary gear sets, upgraded clutch packs, and a larger torque converter than the standard 4L60E. It is rated for higher torque input and is the correct transmission for the 6.0L engine in factory heavy duty applications. Sourcing a LY6 engine 4L70E combo pulled from the same donor vehicle gives you a matched set with confirmed mileage and a single documented service history.

Swap Popularity

The Chevy 6.0 engine turnkey setup has become one of the most popular swap combinations in the C10, square body, and first gen Suburban communities. The LY6 drops into any LS-compatible swap chassis with standard Gen IV mounts and bellhousing dimensions. The iron block keeps the swap cost lower than an aluminum block LS build in some applications. The output and torque capacity of the 6.0L make it a better platform than a 5.3L for heavier chassis builds.

Technical Specifications

Engine Specifications

Transmission Specifications

Specs vary slightly by model year and application. Call us with your RPO code before ordering to confirm the exact variant in current inventory.

What Is Included

Included components vary by unit. Here is what a typical GM 6.0 V8 engine and transmission for sale package from McClain includes.

Standard With Most Units

• Complete LY6 long block assembly
• Intake manifold
• Fuel rails and injectors
• Valve covers
• Oil pan
• Variable valve timing actuator
• 4L70E transmission with torque converter
• Transmission cooler lines, condition noted

Available on Select Units or by Request

• Engine wiring harness
• ECU, PCM, TCM
• Throttle body and sensors
• Transfer case, confirm availability at time of order
• Front accessory drive components

A Note on ECU and Wiring

Wiring harness and ECU are not assumed to be included unless we confirm them before the order ships. The Gen IV 6.0L ECU controls both the engine and the 4L70E transmission electronically. For a direct factory replacement, your original ECU and harness are typically reused. For a swap application, a dedicated LS swap harness and a compatible TCM solution are required. Tell us your application when you call and we confirm what is available.

Condition and Inspection

Every 6.0 LY6 swap package that ships from our Cleveland warehouse goes through a thorough inspection. Both the engine and transmission are evaluated separately before the unit ships.

What We Check Before Every Unit Ships

• Compression test on all eight cylinders, actual numbers recorded
• Full visual inspection of block, heads, and external surfaces for cracks, leaks, or damage
• Oil condition checked for contamination or signs of neglected service intervals
• Coolant passages inspected for signs of mixing or head gasket issues
• Mileage verified against donor vehicle documentation
• Fuel rail and injector condition inspected
• Variable valve timing actuator checked for condition
• Transmission inspected for case cracks, leaks, and external damage
• Transmission pan inspected for debris or metal contamination
• Torque converter condition noted
• No audible knocking, slipping, or unusual noise confirmed before packaging

Both the engine and transmission are documented separately in our pre-ship inspection report. You receive condition notes on both components before the order is finalized.

Vehicle Compatibility

The LY6 6.0L engine was factory-fitted in the following vehicles:

• Chevrolet Silverado 2500HD and 3500HD, 2007 to 2014
• GMC Sierra 2500HD and 3500HD, 2007 to 2014
• Chevrolet Express 2500 and 3500 Van, 2007 to 2014
• GMC Savana 2500 and 3500 Van, 2007 to 2014

Before ordering for a direct factory replacement, confirm your VIN and RPO code. The flex fuel LC9 variant and standard LY6 differ in injector calibration and ECU tune. Confirm which variant your vehicle uses before ordering.

Common Swap Applications

The 6.0 LY6 swap package is a popular choice for the following builds:

• C10 and square body Chevy truck builds
• First and second gen Suburban builds
• Custom tube chassis and off-road builds
• Diesel-to-gas conversion projects
• Heavy tow rig builds requiring iron block durability
• Any LS-compatible swap chassis where 6.0L displacement is preferred over 5.3L

For swap applications, confirm oil pan clearance, transmission crossmember fitment, and driveshaft length before ordering. Call us with your application and we give you practical guidance on what the build requires.

Swap and Installation Notes

The LY6 is one of the most straightforward LS swap candidates available. Port fuel injection keeps the fuel system simple compared to direct injection Gen V engines. Standard LS swap mounts, headers, and oil pans are available for nearly every common swap chassis.

Fuel System

The LY6 runs a standard returnless port injection fuel system. A standard electric fuel pump sized for the application works. No high pressure direct injection pump is required, which simplifies the fuel system compared to Gen V EcoTec3 engines.

ECU and Wiring

The factory LY6 ECU controls both the engine and the 4L70E transmission. For swap applications, most builders use a dedicated LS swap harness from a supplier like Speartech or Painless. A standalone ECU solution compatible with the 4L70E is also an option. Confirm your ECU and TCM solution before ordering the package.

Transmission and Driveshaft

The 4L70E uses a standard GM rear output flange. Measure your driveshaft length before ordering a custom shaft. The 4L70E is longer than a 4L60E by a small margin, which affects driveshaft length in some chassis applications. Confirm transmission tunnel clearance for your specific build.

Cooling System

The iron block LY6 retains heat more than an aluminum block engine. As a result, confirm your radiator is properly sized for the application. A quality aluminum radiator with adequate core size is recommended for any swap build, particularly in a tighter engine bay or a towing application.

Shipping and Warranty

Shipping

We ship from Cleveland, Ohio to all 50 states. Every drivetrain package ships on a secured freight pallet, fully protected for transit. Engine and transmission are palletized together. Most orders are processed and ready to ship within 1 to 3 business days after confirmation and payment. You receive a tracking number once the package leaves our facility.

Warranty

Every drivetrain package we sell comes with a 6-month warranty against internal mechanical defects on both the engine and transmission. Transmission pan inspection results and engine condition documentation are disclosed before the order is processed. If a covered mechanical failure occurs within the warranty period, contact us. We work toward a fair resolution, whether a replacement, credit, or repair guidance depending on the situation.

We have been honoring warranty claims since 2009.

About McClain Auto Part

We have been sourcing and selling used GM engines and drivetrains since 2009. Over 10,000 engines shipped. Rated 4.9 out of 5 stars across 800 or more verified Google reviews. Every unit we sell is physically in our Cleveland, Ohio warehouse, inspected by our team, and ready to ship.

We are not a listing aggregator or broker. When you call us about a LY6 engine 4L70E combo, you are talking to someone who understands the Gen IV LS platform, knows the differences between the LY6 and lighter duty 5.3L applications, and can give you accurate information about the specific units in current inventory.

Frequently Asked Questions

What Is the LY6 Engine?

The LY6 is a 6.0L Gen IV V8 that GM used in heavy duty trucks and vans from 2007 to 2014. It uses a cast iron block, port fuel injection, and variable valve timing. It is tuned for low end torque and durability in demanding towing and hauling applications.

What Is the Difference Between the LY6 and the 5.3L?

The LY6 uses a cast iron block compared to the aluminum block on most 5.3L engines. It displaces 6.0L compared to 5.3L, which produces more low end torque. The LY6 is also factory-rated for higher sustained load capacity, making it a better fit for heavy towing and work truck applications.

Is This a Complete Turnkey Package?

Yes. The package includes the LY6 long block and 4L70E transmission pulled from the same donor vehicle. Additional components like harness, ECU, and transfer case vary by unit. Confirm at time of order.

How Many Miles Are on the Engine and Transmission?

Mileage is verified from donor vehicle records. We give you the exact mileage on the specific unit before you commit to the order.

Is the Engine Compression Tested?

Yes. Every cylinder is compression tested before the unit ships. We record the actual numbers and provide them on request.

Does It Include a Wiring Harness and ECU?

Not automatically. Harness and ECU are available on select units. Tell us your application when you call and we confirm what is in stock.

What Vehicles Does This Fit?

Factory applications include the Silverado HD, Sierra HD, Express Van, and Savana Van from 2007 to 2014. The LY6 is also a popular swap engine for C10 builds, square body trucks, first gen Suburbans, and custom chassis applications.

What Does the Warranty Cover?

Six months from purchase against internal mechanical defects on both engine and transmission. Condition of both components is documented and disclosed before the sale. Contact us if a covered issue arises.

Ready to Order

If you are looking for a 6.0L LY6 engine with 4L70E transmission, a complete LY6 6.0 engine turnkey package, or a tested Chevy 6.0 engine turnkey setup for a swap or factory replacement, call us. Confirm your application and RPO code and we will tell you exactly what we have in stock. Mileage, transmission condition, included components, and shipping timeline.

Clean LY6 and 4L70E inventory moves consistently. If you have questions before committing, ask them.