GM / Chevy 4L80E Transmission Case (1999–2003, 7-Bolt)

GM / Chevy 4L80E Transmission Case (1999–2003, 7-Bolt)

The GM/Chevy 4L80E transmission case (7-bolt) is a critical component for vehicles equipped with the 4L80E 4-speed automatic transmission from 1999 through 2003. This transmission case provides the structural foundation for internal components such as planetary gear sets, clutches, valve bodies, and the torque converter. Its durable 7-bolt design ensures reliable alignment, long-lasting performance, and protection under high-torque conditions, making it ideal for trucks, SUVs, and heavy-duty applications.

Over time, cracked, worn, or damaged transmission cases can lead to fluid leaks, misalignment of internal components, and premature wear of gears and clutches. Replacing the 4L80E transmission case restores structural integrity and protects internal components, ensuring smooth operation and reliable gear engagement. Installing a new case during a rebuild also extends transmission life, especially in high-mileage or high-load vehicles.

This 7-bolt 4L80E case is compatible with 1999–2003 GM and Chevrolet vehicles only. Always verify your transmission code, model year, and vehicle application before ordering to ensure proper fitment. Proper verification ensures correct alignment, torque transfer, and long-term reliability.

For best results, pair this transmission case with a complete rebuild kit, including clutches, seals, bearings, and friction components. Customers can also explore related components on our site, including 4L80E valve bodies, pump assemblies, torque converters, and hard parts, to complete a full transmission service.

GM 4L80E Transmission Parts

Vehicle Compatibility

GM / Chevrolet Applications

• Chevrolet Silverado 2500 / 3500 (V8, Diesel & Gas): 1999–2003

• Chevrolet Tahoe / Suburban: 1999–2003

• GMC Sierra 2500 / 3500 / Yukon: 1999–2003

• Hummer H1 / H2: 1999–2003

Fitment Notes

This 4L80E transmission case fits 7-bolt GM/Chevy transmissions only. Always confirm the transmission code, engine type, and model year before purchase. Proper verification ensures correct internal alignment, smooth shifting, and extended transmission life.

Consult official GM service manuals for installation procedures and torque specifications.

Below is a diagram of the 4L80 transmission!

4L80E Transmission Diagram