Fig 4. Location of where the actual Cracking Occurs.
6L80 / 90
Units Dec. 2008 and prior used standard plastic design sealing rings that caused a 2-3 Flare or delay, with harsh engagement into FWD and Rev. OEM updated pump stators (K62895A / C) come with a new sealing ring / o-ring design for a better seal at the pump stator. The new design offers a sealing ring with notches and an o-ring that goes inside for a better more secure seal.
Fig 1. O-ring seal that goes inside the newly designed sealing ring for a more secure and longer lasting seal
Fig 2. Newly updated sealing ring with notches for a better and longer lasting seal.
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6L80 / 90
Units built prior 2010 can slip in any of 1-2-3-4 gears, caused by a cracked 1-2-3-4 clutch piston in the 1-2-3-4 / 3-5-Reverse Drum. The clutch piston redesigned by the factory to be 22% thicker than the original to be more resistant to cracks the new
part # is 62841C and Retrofits to all years.
New Piston is 22% Thicker and Very Resistant to cracks and pressure loss.
6L80 / 90
TEHCM - Transmission Electro-Hydraulic Control Module is a 32-bit TCM and solenoid body installed a 6-speed Automatic Transmission. the TEHCM includes the TCM, Solenoids, Pressure Switches, and Temp Sensor. All as one complete unit bolted to the valve body. When purchasing or installing a TEHCM it needs to be programmed to the vehicle it is going into.
6T70 / 6F50
Part # 57309B has been Factory Updated to be thicker and more resistant. When this plate breaks in the 6T70 / 6F50 units the transmission goes ballistic and practically explodes internally. Damages the rear covor, the 4-5-6 clutch drum and everything in between.
6T70/75E Transmissions in 2013 had changes done to the electronic components, clutch and steel plates. the new RPO (Regular Production Option) codes are M7W, M7U, M7V, M7X
and can be found in either the glove box, center console, and
spare tire/jack section of the car. All GM Transmission RPO codes start with the letter "M." The RPO tag is in alphabetical order