Transmissions That Maximize LS Engine Performance!

Let’s Talk Transmissions

Words by Summit Racing

When it comes to engine swaps in trucks, the GM LS engine is king. It’s lightweight and compact, and it pumps out big power without breaking the bank. Plus, LS engines are everywhere, from junkyards, classifieds, and aftermarket catalogs, making them one of the most affordable and versatile powerplants around. But dropping an LS under the hood is only half the story. To handle all that grunt, you need the right transmission, and there are some solid go-to options that dominate the swap scene.

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The LS engine’s popularity boils down to reliability, power, and ease of integration. GM made these engines modular, meaning they work well with many GM transmissions. Whether you’re building a trail beast, a tow rig, or a street cruiser, pairing the LS with the right tranny is the key to a bulletproof setup.

Here are the most common options for LS swaps in trucks:

4L60E/4L65E

The bread-and-butter automatic for LS swaps, the 4L60E/4L65E is electronically controlled, easy to find, and handles moderate power builds without drama. Affordable rebuild kits and upgrades make this a strong choice for budget builds.

4L80E

Need something beefier? The 4L80E is the heavyweight champ. It’s tougher than the 4L60E and thrives in high-horsepower, heavy-hauling applications. If you’re building a serious street machine or off-road bruiser, this one’s for you.

TREMEC T56 Magnum

Prefer to row your own gears? The T56 Magnum is the Holy Grail of manual transmissions for LS swaps. It’s strong, reliable, and offers precise shifts—perfect for trucks that are built to shred pavement.

The GM LS engine’s combination of affordability, availability, and performance makes it the go-to for truck swaps. Pair it with the right transmission—whether it’s a 4L60E for daily duty or a 4L80E for monster torque—and you’ve got a setup built to dominate. Trust Summit Racing to hook you up with the goods to get your swap running smooth.

1. Bowler GM LS T-56 Magnum

The Bowler Performance T-56 Magnum 6-speed transmission is built to handle massive torque, making it ideal for high-performance LS swaps. With customizable gear ratios and a durable single rail shifter, it’s a versatile choice for your hot rod project.

2. GearStar GM 4L60E Level 4

GearStar’s GM 4L60E Level 4 transmission is custom-built and dyno-tested for unmatched reliability and performance. Hand-assembled by a single technician, it’s engineered to handle heart-pounding power with precision and durability.

3. Summit Racing 4L60E Transmission

Summit Racing 4L60E automatic transmissions offer reliable performance and exceptional value with fully remanufactured components, including hardened sunshells and high-energy bands. Dyno-tested for quality, these transmissions are perfect for your GM LS-powered build.

4. TCI StreetFighter 4L60E Transmission

The TCI StreetFighter 4L60E offers a manual/automatic valve body for versatile performance, allowing precise manual shifts or smooth automatic driving. Built for tough street machines, it delivers race-quality shifts and dependable durability.

5. B&M PreRunner 4L60E Transmission

The B&M PreRunner 4L60E is designed for off-road power, featuring a durable aluminum case, deep pan, and hardened steel input shafts. Built with over 65 years of expertise, it’s a reliable choice for rugged trail performance.

6. Summit Racing 4L60E 4WD Transmission

Summit Racing 4L60E 4WD automatic transmissions deliver durability and value with remanufactured components like hardened sunshells and high-energy bands. Dyno-tested for reliability, these units are ideal for GM 4WD applications.

7. VEGE Remanufactured 4L60E Transmission

VEGE remanufactured 4L60E transmissions deliver OEM-level quality at a budget friendly price, featuring fully machined and assembled components. With an included torque converter and fluid, these units are ready to get your RWD vehicle back on the road quickly.

8. Hughes Street & Strip 4L60E Transmission

Hughes Performance Street & Strip 4L60E transmissions are built for strength and reliability, featuring internal and external racing components. With a manual/automatic valve body, they deliver precise shifts for both street and track use.

9. TCI Maximizer 4×4 4L60E Transmission

The TCI Maximizer 4×4 4L60E transmission is built to handle the demands of lifted and off-road vehicles. With robust components and crisp, reliable shifts, it’s designed for durability and top-tier performance in 4WD applications.

10. TCI 6x 6-Speed 4L80E Transmission

The TCI 6x 6-speed 4L80E transmission delivers six gears and lockup compatibility, handling up to 850hp for ultimate performance. Designed for Chevy small-block, big-block, and LS engines, it’s perfect for pro-touring, street, and race applications.

11. GearStar GM 4L80E Level 3 4WD

GearStar’s GM 4L80E Level 3 4WD transmission is designed for LS-style engines, delivering unmatched performance and reliability. Built with premium components and a high-quality torque converter, it’s engineered for heart-pounding, road-proven durability.

12. ATI Street Rod 4L65E Package

ATI Street Rod transmission packages include a 4L65E Street/Strip transmission, Streetmaster torque converter, cooler, and locking dipstick for a complete high-performance setup. Built to handle powerful engines, these kits ensure seamless power transfer to the rear differential.

13. B&M PreRunner 4L60E Transmission

The B&M PreRunner 4L60E transmission is built for off-road dominance, featuring an aluminum case, deep pan, and hardened steel input shafts. Backed by 65 years of expertise, it’s designed to handle the toughest trail conditions with ease.

14. GearStar GM 4L65E Level 3 Transmission

GearStar’s GM 4L65E Level 3 transmission is hand-built by a single technician and dyno-tested for unmatched quality and performance. Designed for 2WD applications, it’s engineered to deliver reliable, high-powered performance with a premium torque converter included.

GET THE GOODS

Whether you’re hunting for an aftermarket transmission or a quality rebuild, Summit Racing is the go-to supplier. Summit stocks everything from performance-enhanced 4L80Es to T56 kits with all the bells and whistles. Plus, its tech support is top-notch when it comes to matching the right parts to your build.