Product Details

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Transgo OEM size boost valve and sleeve kit for the GM 6L45, 6L50, 6L80, and 6L90 automatic transmission.

Product specifics:

• Brand: Transgo
• Part number: 6L8-BOOST-OES
• Covered models: 6L80, 6L80E, 6L80-E, MYC, 6L90, 6L90E, 6L90-E, MYD
• Makes: GM, Cadillac, Chevrolet, GMC, Hummer, and Pontiac
• Year range: 2006-up
• Country of origin: USA
• Genuine Transgo brand: YES
• Transmission removal is required.

In 2006 and later General Motors and BMW vehicles equipped with 6L45, 6L50, 6L80 and 6L90 automatic transmissions often wear out the line pressure boost valve and sleeve. As a result, the transmission will not have the required main line pressure boost under load.

The computer tailors the line pressure rise in accordance with the calculated load. It does this by varying the pressure control solenoid current, which in turn varies the EPC solenoid pressure output. The pressure control solenoid output then acts on the boost valve, which in turn acts on the pressure regulator valve to raise the main line pressure accordingly.

Adequate main line pressure rise is required to provide enough clamping force under all load conditions to prevent slipping, as well as to achieve proper shift quality. Consequently, a compromised boost valve will cause complaints of soft shifts, flare shifts, burnt frictions and burnt lock-up clutch can occur. These can also be accompanied by a wide variety of gear ratio, shift, and solenoid performance codes.

Features and benefits:

The TransGo drop-in OE ratio replacement boost valve and bushing assembly provides an economical and durable direct replacement for the OEM assembly that is prone to wear. This kit restores hydraulic integrity, as a result line pressure boost will once again meet the OE specifications. Our drop in valve requires no reaming or tooling.

Corrects, Prevents, and Reduces:

• Insufficient line rise
• Soft, slipping, or flaring shifts
• Burned friction clutches.
• Codes P0729, P0731, P0732, P0733, P0734, P0735, P0736, P0961, P0965, P0969 and P0741
• TCC-Torque Converter Clutch slip

Kit Includes:

• Precision USA-made hardened steel OEM replacement valve
• Precision made 6160 aluminum bushing.
• Retaining pin

These transmissions can be found in the following vehicles; however, you should double check your application.  It is common for similar vehicles to have multiple transmission options available from the factory.

Cadillac

• CTS 6.0L 2007-2009
• Escalade, EXT, ESV 2007-2015
• STS-V V8 Supercharged 2006-2011
• XLR 2006-2009

Chevrolet

• Avalanche 1500 2009-2012
• Camaro V8 naturally aspirated 2009-2015
• Caprice 2009-2013
• Colorado 5.3L 2008-2012
• Corvette 2007-2014
• Express Van 1500 2009-2017
• Silverado Truck 1500, 2500 2008-2021
• Suburban 1500 2009-2020
• Tahoe 2009-2020

GMC

• Canyon 5.3L 2008-2012
• Savana Van 2500 2009-2017
• Sierra Truck 1500, 2500 2008-2021
• Yukon 2009-2020
• Yukon XL 1500 2009-2020
• Yukon Denali 2007-2015

Hummer

• H2 2008-2010
• H3 5.3L 2008-2011

Pontiac

• G8 V8 2008-2010

These transmissions are part of the Turbo Hydramatic or Hydra-Matic series and also known by the following codes and part numbers: 6L80, 6L80E, 6L80-E, MYC

This upgraded boost valve kit fits the following years: 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, and 2017, 2018, 2019, 2020, and 2021.