Master-Built GM 6L80 Transmission (Heavy Duty)

Built to last and engineered to eliminate factory weak points. Whether you are hauling heavy loads or need absolute reliability for your daily driver, our 6L80 transmissions are fully torn down, inspected, and remanufactured in-house. Every build is completed under the strict standards of an ASE Master Mechanic with 40 years of diagnostic and rebuilding experience.

We do not just replace broken parts—we upgrade the entire system to ensure it outlasts the original factory design.

6L80 Build Specifications:

• Upgraded clutch packs and internal components for improved durability and shift quality.

• Precision-machined internal components restored to OEM tolerances.

• Fully remanufactured valve body for accurate hydraulic and electronic operation.

• Upgraded seals and gaskets to help prevent leaks and fluid loss.

• Fully remanufactured, upgraded billet torque converter for improved efficiency, reliability, and power transfer.

• Hardened pump rings installed during the complete teardown for maximum heavy-duty durability.

• 100% inspection and testing of all hydraulic and electronic components.

• SIM tested under load to simulate real-world driving conditions before it ever leaves our facility.

Shipping & Core Return:

We ship our 6L80 builds nationwide using fast, reliable LTL freight and hot shot carriers. A core charge applies to this purchase and will be promptly refunded once your fully drained, securely strapped core is returned to our shop and inspected. Please see our Core Return & Freight Logistics page for exact preparation instructions.