LS3 & L99 Dropout Motors: Where to Find Complete LSX Engine Swap Packages

If you’re planning an LS swap and want something powerful, reliable, and as close to plug-and-play as possible, a 6.2L L99 / LS3 engine with a 6L80 automatic transmission dropout is one of the best options on the market. These complete LSX swap dropouts are highly sought after by builders who want factory performance without piecing together dozens of components.

In this article, we’ll break down what makes LS3 and L99 dropout motors so desirable, what’s typically included in a complete swap package, and where to find quality, tested LS3/L99 dropouts—specifically from J&J Auto Wrecking.

What Is an LS3 / L99 Dropout Motor?

A dropout motor (also called a liftout or donor package) is a complete drivetrain removed from a running vehicle as a single assembly. Instead of buying just an engine, you’re getting a fully matched setup designed to work together from the factory.

In the case of a 6.2L L99 LS3 engine with a 6L80 automatic transmission, a true dropout typically includes:

  • 6.2L L99 V8 engine

  • 6L80 automatic transmission

  • Engine accessories (alternator, brackets, etc.)

  • Factory wiring harness

  • ECU / ECM

  • Electronic throttle pedal

  • Sensors and related components

This type of package is ideal for:

  • LS swaps into classic cars

  • Truck and SUV conversions

  • Restomod builds

  • Performance street cars

  • Track or autocross projects

Instead of chasing compatibility issues, you’re starting with a factory-matched drivetrain.

LS3 vs L99: What’s the Difference?

The LS3 and L99 are closely related 6.2L GM V8 engines, but there are a few important differences builders should understand.

LS3

  • Found in manual-transmission vehicles

  • Higher factory horsepower

  • Aggressive camshaft profile

L99

  • Found in automatic-transmission vehicles (like Camaros with the 6L80)

  • Uses Active Fuel Management (AFM) from the factory

  • Slightly lower horsepower stock

  • Excellent base for cam swaps and AFM delete builds

For many builders, the L99 is actually preferred because:

  • It’s commonly paired with the 6L80 automatic

  • AFM can be deleted easily during a build

  • Internals are very similar to the LS3

That makes an L99 + 6L80 dropout a perfect starting point for an LSX swap.

Why the 6L80 Transmission Matters

The 6L80 automatic transmission is a major reason these dropouts are so valuable. It’s a modern, electronically controlled six-speed that offers:

  • Strong torque capacity

  • Excellent street drivability

  • Tight gear spacing

  • Compatibility with factory GM tuning

  • Broad aftermarket support

Buying an engine and transmission that were originally paired together—like this 2015 Camaro L99 / 6L80 setup—eliminates guesswork and simplifies tuning and wiring.

Real-World Example: 2015 Camaro L99 / 6L80 Dropout from J&J Auto Wrecking

One standout example currently offered by J&J Auto Wrecking is a 2015 Chevy Camaro 6.2L L99 engine with 6L80 automatic transmission dropout.

Key Details:

  • Engine: 6.2L L99 V8

  • Transmission: 6L80 Automatic

  • Vehicle: 2015 Chevy Camaro

  • Mileage: 43,936 miles

  • VIN: 2G1FK3DJ5F9104130

  • Stock #: SFCE443

  • Condition: Quality inspected, in stock

  • Test Status: Video tested (YouTube search “sfce443”)

What’s Included:

  • Engine

  • Transmission

  • Accessories

  • Factory harness

  • ECU

  • Throttle pedal

This is exactly what serious builders are looking for when searching for a complete LS3/L99 engine swap dropout.

Why Builders Choose J&J Auto Wrecking for LS Dropouts

Not all salvage yards are created equal. When it comes to high-dollar swap components, reputation and documentation matter.

Video-Tested Inventory

J&J Auto Wrecking is known for video-testing engines before sale. Buyers can see the engine run, hear it idle, and verify condition before committing.

Known Mileage & VIN Transparency

Listings clearly show mileage, VIN numbers, donor vehicle info, and fitment notes—critical for serious swap projects.

Complete Swap Packages

Unlike partial pullouts, J&J focuses on true dropouts that include the hard-to-find components most swap projects need.

Fast Shipping & Local Pickup

  • Daily shipping via UPS, USPS, and freight

  • Professionally palletized drivetrain assemblies

  • Local pickup available, often ready within 24 hours

Warranty & Peace of Mind

Every engine is backed by a 60-day guarantee with hassle-free returns or exchanges—something you won’t get from private sellers or sketchy marketplaces.

Why Buy a Dropout Instead of Piecing a Swap Together?

Many builders underestimate how quickly costs add up when sourcing parts individually. Buying a complete LSX swap dropout often saves money, time, and frustration.

Benefits include:

  • Matched engine and transmission

  • Correct wiring and electronics

  • Reduced tuning complexity

  • Faster install time

  • Higher resale value of the finished build

For anyone serious about an LS swap, a complete L99 / LS3 dropout is the smart move.

The Right LS Swap Starts with the Right Donor

If you’re searching for a high-quality LS3 or L99 engine swap package, a 6.2L L99 with a 6L80 automatic dropout is one of the best foundations you can buy. With low mileage, factory-matched components, and modern drivability, it’s hard to beat.

J&J Auto Wrecking stands out as one of the most trusted sources for these dropouts—offering tested inventory, transparent listings, fast shipping, and real support from a family-owned business that’s been doing this since 1957.

When it comes to LS swaps, the right donor motor makes all the difference—and J&J has the ones serious builders are searching for.

Back to R.I.P. (Rest In Parts)