6L80 - how to Disassemble a 6L80 Transmission (Step-by-Step Guide) Bilingual English/Spanish

I. Introduction & Fluid Check (0:00-2:30)

This section introduces the 6L80-E transmission from a 2009 Chevrolet truck, highlighting its first-time bilingual instruction. The initial steps involve removing the transmission pan to assess the fluid condition, revealing metal debris and indicating internal problems.

II. Valve Body Removal & Overview (2:30-7:30)

The valve body is removed using a special Snap-On tool for precise torque application. This section explores the valve body components, including solenoids, the internal mode switch (manual valve), speed sensors, and seals.

III. Case Disassembly & Snap Ring Removal (7:30-15:00)

Focus shifts to the transmission case, emphasizing the difficulty of removing a large snap ring without proper pliers. The narrator demonstrates a technique for safely removing the snap ring using a screwdriver and patience.

IV. Clutch Pack Inspection (15:00-22:00)

This segment examines various clutch packs, noting new frictions but discolored steels, indicating potential overheating or stress. The narrator debunks myths about "burnt" clutches, highlighting normal discoloration versus actual damage.

V. Piston & Drum Analysis (22:00-28:30)

The inspection continues with the identification of a small crack in a piston, a common failure point. The narrator explains the importance of a small orifice in the drum, often mistaken for damage, and its function in pressure regulation.

VI. Pump Disassembly & Wear Assessment (28:30-34:00)

The pump is disassembled, revealing a vane-type design common to General Motors transmissions. The narrator points out signs of wear on the pump slide and emphasizes the importance of checking for scoring or damage.

VII. Second Snap Ring Removal & Low Reverse Friction Inspection (34:00-40:30)

Another large snap ring removal is tackled, requiring a cautious approach using screwdrivers to avoid injury. This section reveals new low reverse frictions but notes discolored steels, again hinting at potential stress or overheating.

VIII. Valve Body Disassembly & Component Analysis (40:30-52:00)

The valve body is meticulously disassembled, revealing check balls, a spacer plate with molded gasket, and various valves. The narrator meticulously checks each valve for freedom of movement and proper function.

IX. Troubleshooting & Contamination Emphasis (52:00-59:30)

The focus shifts to problem-solving, highlighting a piece of gasket and rubber found stuck in the valve body. This emphasizes the importance of cleanliness during valve body work to prevent malfunctions. The narrator also discusses potential torque converter damage based on observed symptoms.

X. Fluid & Conclusion (59:30-65:00)

The narrator revisits the topic of special fluid required for the 6L80-E, explaining its higher temperature tolerance and demanding operating conditions. The teardown and inspection conclude, summarizing findings and emphasizing the importance of careful observation and component analysis.
This is a tear-down of a 6L90-E transmission of a 2009 Chevy Avalanche. What I explain here is what I have seen so far with these transmissions.Besides what you see here is is also very important that you perform a Fast Relearn Adaptation. Otherwise you will have unpleasant shifting and drive-ability issues. The part number for the piston is 24238700.