Product Details

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Sonnax line pressure boost kit for the GM 6L45, 6L50, 6L80, and 6L90 automatic transmission.

Product specifics:

• Brand: Sonnax
• Part number: 6L80-LB1
• Covered models: 6L80, 6L45E, 6L50E, 6L80E, 6L90E.
• Makes: GM, BMW, Buick, Cadillac, Chevrolet, GMC, Hummer, and Pontiac
• Year range: 2006-up
• Instructions included: Yes.
• Transmission removal is required for full installation.
• No special tools are required for installing these parts.

The Sonnax hydraulic line pressure booster kits contain stronger pressure regulator springs and large ratio boost valves designed to work together to provide progressive pressure increases as driving conditions become more demanding.

The pressure regulator springs are approximately 10% stronger than OE and more conservative in impact than other aftermarket “kit” springs. Large ratio boost valves provide higher pressure incrementally and when it is needed the most. The combination of these springs and valves in a Sonnax kit gives you the best of both worlds: a modest pressure increase at the low end, with a high-end pressure that is equal to or greater than that of other aftermarket “kit” springs.

Stronger pressure regulator springs raise pressure equal amounts at idle and maximum pressure. Many aftermarket “kit” springs are a compromise, raising pressure too much at idle and not enough at maximum pressures. Larger boost valves, on the other hand, have a progressive effect on pressure, changing the rate of pressure increase.

The Sonnax large ratio boost valves and stronger pressure regulator springs are designed to work together. This is an ideal combination: smooth engagements and lower load on the pump at idle, but a greater increase in pressure as the transmission is worked harder.

For a more in-depth look at raising line pressure, read The Prescription for Optimum Pressure in the Sonnax online technical library.

• Kit fits all 6L45–6L90 applications.
• Achieve shorter shifts and increased torque capacity without creating low speed harshness.
• Improved band and clutch holding capacity for increased durability.
• Progressive pressure increases as driving conditions become more demanding.
• All the benefits of increased line pressure without overloading the pump at idle.
• Drop-in Zip Valve^™parts install quickly and easily.

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.

BMW (18 bolt transmission pan)

• 116i, 118i, 120i, 125i, 128i, 130i 2007-2012
• 316i, 318i, 320i, 323i, 325i, 325xi, 328i, 328xi, 330i, 330xi 2007-2009
• X3 2.5si, 3.0i, 3.0si 2007-2011

Buick

• Electra 2010-2011
• Park Avenue 2010-2011

Cadillac

• ATS 4cyl 2012-2013
• ATS V6 2012-up
• CTS 2.8L 2007
• CTS 6.0L 2007-2009
• CTS V6 2007-up
• Escalade, EXT, ESV 2007-2015
• SRX Wagon 2007-2009
• STS 2007-2012
• 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: 6L45, 6L45E, 6L45-E, MYA, 6L50, 6L50E, 6L50-E, MYB, 6L80, 6L80E, 6L80-E, MYC, 6L90, 6L90E, 6L90-E, MYD.

The 6L80 Boost valve and spring booster kit fits the following years: 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, and 2017, 2018, 2019, 2020, and 2021.