6L80 6L90 Pump Upgrade Kit for GM Transmissions STL012

Transmission pump upgrade kit designed for compatible GM 6L80 and 6L90 automatic transmissions. Cross-references Superior/TransLab part number STL012.

Product Purpose

This upgrade kit is intended for transmission pump service during a professional rebuild or repair. It uses a no-ream, drop-in pressure-regulator valve design to support improved pressure regulation, torque converter clutch apply, and lubrication control.

Helps Address Pump Pressure Concerns

The kit is commonly installed when servicing a 6L80 or 6L90 pump with pressure-regulation concerns. Excessive line pressure can contribute to stress and possible damage involving the 1-2-3-4 drum, 3-5-Reverse drum, and associated pistons. The upgraded design helps manage the failsafe or brown-out maximum line-pressure condition at approximately 285 PSI.

Application

Compatible with GM 6L80 and 6L90 six-speed automatic transmissions used across select Chevrolet, GMC, Cadillac, and Hummer applications. Vehicle fitment varies by year, engine, drivetrain, transmission code, and pump configuration.

Confirm the transmission model and pump configuration before ordering. Do not rely on vehicle year or model alone.

Service Information

• Reference part number: STL012

• Product type: Transmission pump upgrade kit

• Transmission applications: GM 6L80 and 6L90

• Installation type: Drop-in, no-ream design

• Primary service area: Transmission pump pressure-regulator circuit

• Intended use: Transmission rebuild, pump repair, and hydraulic-system service

Transmission symptoms such as harsh shifts, delayed engagement, slipping, converter-clutch concerns, low pressure, or internal clutch damage can have multiple causes. Inspect the pump body, pressure-regulator bore, valve body, torque converter, clutches, cooler system, electrical components, and related hydraulic circuits before replacing parts.

Use the vehicle manufacturer’s specified ATF after service. Lubegard ATF Protectant may be considered when compatible with the application and used according to product directions.