4L80E TRANSMISSION INFO AND OVERVIEW

The 4L80E represents GM's heavy-duty evolution of the legendary TH400 (Turbo 400), introducing an overdrive gear and electronic control to enhance power management and highway drivability. This transmission is inherently robust straight from the factory, but when properly built, it becomes an unstoppable performance unit capable of handling massive horsepower and extreme towing. Our experience spans thousands of builds, from heavy-hauling work trucks to 1,000+ HP street/strip applications.

COMMON FAILURE POINTS (STOCK):

  • Direct Clutches (Burn-up under high load/RPM)

  • Intermediate Sprag (Rollover failure)

  • Forward Clutch Hub

  • Input Shaft (Under extreme torque)

PERFORMANCE SOLUTIONS: Through extensive testing and track validation, we've developed three distinct build levels addressing these specific weaknesses. Each stage incorporates progressively stronger components to handle whatever you throw at it.

KEY IMPROVEMENTS:

  • Dual-feed direct clutch modifications to double the holding power

  • Heavy-duty 34-element intermediate sprags to prevent rollover

  • Billet forward clutch hubs and input shafts to eliminate breakage under severe load

  • Updated valve body recalibration for crisp, authoritative shifts

Schedule Diagnosis (Please Plan to leave Vehicle)

4L80E Automatic Transmission Rebuild (4L80)

  • 4L80E-transmission-rebuild-package-chevy-gm-automatic-transmission-service

    Turn Key 4L80E Rebuild (Includes Torque Converter) $3,899 Starting Price

    The Flagship 4L80 Performance Package Built to handle serious torque, massive payloads, and high horsepower. This comprehensive, turn-key service includes professional removal, custom rebuilding, complete vehicle integration, and rigorous diagnostic testing.

    Inside the Build:

    • Dual-Feed Direct Modification: Hydraulically modified to apply twice the holding force to the direct clutches, preventing high-RPM burn-up.

    • 34-Element Intermediate Sprag: Significantly stronger than the factory unit to withstand harsh shifts and heavy acceleration.

    • Upgraded Forward Hub: Reinforced or billet options to eliminate the notorious factory spline failure point.

    • Performance Converter: Heavy-duty remanufactured or custom billet torque converter built specifically for your application.

    The Service Package Includes: Professional removal and installation. Premium synthetic fluid and all necessary build components. 12,000-mile check-up and pan inspection.

    Don't settle for a factory rebuild. Our flagship 4L80 Performance Package is built to take a beating. We eliminate the factory weak points and upgrade your unit with dual-fed direct clutches, a heavy-duty sprag, and rock-solid internal components. This is a complete, turn-key package: we handle the professional removal, custom bench build, heavy-duty torque converter pairing, and installation using premium synthetic fluids. After thorough diagnostic testing, you get a 12,000-mile pan inspection and our full 24-month/24,000-mile warranty covering all parts, fluids, and labor. Built for power, backed for peace of mind.

    Payment Notice: A 3.5% convenience fee is applied to all credit card transactions.

    TURN-KEY INSTALLATION & INTEGRATION

    Your final installation invoice will reflect the following additions where applicable: Custom Converter, High-Performance Upgrades, Premium Fluids, and applicable NC Taxes.

    AVAILABLE BUILD UPGRADES

    • OEM-Spec Torque Converter: Reliable, factory-level power transfer for heavy towing.

    • Billet Forward Clutch Hub: Essential for high-horsepower or heavy-hauling reliability.

    • Stage 3 Performance Package: Includes 34-Element Sprag, Dual-Feed Direct Mod, and Heavy-Duty Friction modules.

    • Stage 4 Smart-Tech Package: Includes Billet Input Shaft, Billet Intermediate Shaft, Billet Forward Hub, and Rollerized internals for maximum horsepower applications.

    • Custom Billet Components: Available upon request (Quote Required).

    PLATFORM COMPATIBILITY

    • Chevrolet: Silverado 2500HD/3500HD, Suburban 2500, Express Vans, Custom High-HP LS Swaps

    • GMC: Sierra 2500HD/3500HD, Yukon XL 2500, Savana Vans

    • Custom Applications: Any high-horsepower Camaro, Trans Am, or street rod requiring a heavy-duty overdrive transmission.

    Call 704-933-8727 or click to schedule your drop off!