6L80 Archives - Transmission Digest
Dealing with GM 6L series rebuild issues

During a rebuild of a GM 6L80 transmission, while the valve body was being serviced, an incorrect spacer plate was accidentally used. This blocked supply pressure to the 3-5-R regulator valve which prevented the 3-5-R clutch from applying. One of the more significant changes made to the valve body for 6L80 series transmission is related

Seeing the Forest AND the Trees

They say that the proverbial phrase “I couldn’t see the forest for the trees” means that a person or organization cannot see the big picture because it focuses too much on the details. I have seen this phrase used after days of diagnosing a transmission problem without resolve, yet the cause is staring you in

6L80 Gen2 Performance Clutch Pack

The Raybestos Powertrain complete clutch pack module for 2006-up GM 6L80 transmissions features the state-of-the-art, Gen2 Blue performance friction material (p/n RCPBP-51). Gen2 is a power absorbing material that performs with very low wear, excellent fatigue strength, high durability and quick shifts with little shock for even faster times that improves performance in the 6L80

Pressure Checker, Bearing Installer Tool For 6L80/6L90 12-3-4/3-5 Reverse Drum

The new Adapt-A-Case multi-functional tool (p/n T-135PRBRAC) tests the pressure of the 6L80/90 1-2-3-4/3-5 reverse drum to ensure there are no cracks or leaks. Simply place the tool in the drum and use an air gun in each hole to check for leaks. It also installs the bearing to the proper depth by placing the

6L80/6L90 3-5/Reverse Drum Check Tool

The 6L80/6L90 3-5/Reverse Drum Check Tool (p/n T45555-LEAK) from Whatever It Takes (WIT) allows you to air check the weld on the drum for cracks. It is made of billet aluminum and includes a set of sealing rings. For more, visit www.wittrans.com.

Hydraulics Fundamentals: Shift & Relay Valves

Shift valves and relay valves share a lot of the same duties. This article is one of a series by Sonnax exploring how valves and hydraulic circuits work and what results when they quit functioning correctly.

Hydraulics Fundamentals: Clutch Regulator Valves

Knowing how these circuits work and the slightly different variations that the manufacturers utilize should pinpoint any valve body-related issues

6L80/90 3-5/Reverse Drum

The drum may crack at the weld affecting application and setting DCT’s such as P0776.

Sonnax GM 6L45-6L90 Pump Vane

The pump vane is a replacement for rebuilding pump rotors.

Roadmaster Powertrain Introduces 6L80 Reman Transmissions

These units are completely updated and ready to master the road, according to the company.

Tech Tip: GM 6L80, 6L90 Low Line Pressure Repair

After installing the service pump cover, a transmission may have low line pressure. Models 2006-2015 GM Passenger Cars and Trucks equipped with 6L80 or 6L90 Automatic Transmission (RPO MYC or MYD) Condition After installing the service pump cover P/N 24248573, a transmission may have low line pressure. If the low line pressure is not identified

6L80, 6L90 (300mm) Performance Converter Kit

For customers with demanding GM 6L80/90 gas-powered applications that use a full-size torque converter, Sonnax has introduced an easy-to-build, cost-effective performance converter kit (#GM-RK-21). Employing a forged cover, forged piston and three woven carbon friction elements, builders now have a dampered 300mm multi-plate option that delivers significantly increased clutch capacity and durability. By re-using the