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Sonnax O-ring GM-O-19V is an oversized version of standard, OE-sized Sonnax O-ring GM-O-11V. It can be used in GM 6L80 and GM 6L90 (300mm) torque converters with w...Read More
Vehicles with GM 6L45, 6L50, 6L80 and 6L90 transmissions may have complaints of vibration, shudder or roughness, particularly while driving at low speeds with a st...Read More
Vehicles with listed GM transmissions may exhibit insufficient line rise in drive ranges, soft shifts and/or burnt clutches. These problems may be caused by contin...Read More
Sonnax front cover GM-CC-13 is a fully machined forging for use in GM 6L80/6L90 converters. Made from high-quality SAE 1026 steel, the strength of this cover is im...Read More
Sonnax damper rivets GM-RV-13 are for use exclusively with Sonnax piston plate GM-DA-17P and related performance converter kits to replace weak or failed plates in...Read More
Vehicles with listed GM transmissions may have a number of TCC apply problems. Bore wear at the TCC regulator valve can cause no TCC apply or slipping on engagemen...Read More
Listed GM 6-speed transmissions often set various trouble codes related to failures of fluid pressure switches that are internal to the transmission electro-hydrau...Read More
Sonnax hydraulic line pressure booster kits contain stronger pressure regulator springs and large ratio boost valves designed to work together to provide progressi...Read More
Sonnax external spline clutch plate GM-CP-9 with one woven carbon friction bonded replaces the plate in related multi-plate performance converter kits referenced below.
Sonnax internal spline clutch plate GM-CP-8 with dual-sided woven carbon frictions bonded replaces the plate in related multi-plate performance converter kits referenced below.
Salvage the expensive TEHCM in listed GM 6-speed transmissions by replacing lost or damaged pistons with a direct replacement Sonnax pressure switch plastic piston...Read More
Sonnax TCC Zip Kit 8L45-8L90-TCC-ZIP targets the root cause of multiple converter-related complaints by sealing the critical circuit pressure losses in the GM 8L45...Read More
Sonnax shift Zip Kit 8L45-8L90-SHIFT-ZIP targets the root cause of mulitple shift-related complaints by sealing the critical circuit pressure losses in the GM 8L45...Read More
’06–’09 GM
Sonnax remanufactured valve body GM6L90E has been designed to address common issues, such as: burnt clutches; codes P0751, P0741, P0742; harsh TCC apply; bump, har...Read More
’10-Later GM
Sonnax remanufactured valve body GM6L90L has been designed to address common issues, such as: burnt clutches; codes P0751, P0741, P0742; harsh TCC apply; bump, har...Read More
GM 6L90 (Captive Clutch) torque converters are a nuisance to rebuild. In these converters, the piston is held onto the cover by leaf springs and rivets that are di...Read More
Sonnax solid piston seal GM-O-16 replaces worn or damaged seals in GM 6L90 captive clutch converters
March 17, 2021
This content relates to two discontinued Sonnax parts: pressure regulator valve kit 104520-14K and oversized pressure regulator and boost valve kit 104520-07K. These kits required drilling the pump, and Sonnax now offers equally effective repair options that eliminate that extra labor: drop-in kit [104520-15K] and oversized kit [104520-16K].
The best way to address GM 6L45, 6L50, 6L80, 6L90 pressure regulator valve problems is by replacing a wear-prone OE valve with an improved Sonnax drop-in Zip Valve™ or oversized part. Installation does require drilling a small hole in the pump, though, to prevent excessive line pressure. Learn more about why drilling is necessary and watch the simple, step-by-step process in this quick video.
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GM 6L80 and 6L90 transmissions often suffer failure of the 4-5-6 clutch assembly due to flexing and bowing of the backing plate (coning), especially when clutch ap...Read More
March 15, 2022
Jim Mobley
Ever had the small drill bit break and cause havoc while installing the Sonnax GM 6L45, 6L50, 6L80, 6L90 pressure regulator valve kits? Here is how to fix that issue and most others when using small drill bits in your portable drill motor with standard-size Jacob chuck: create a bit vise out of the red plastic tube commonly sold with aerosol spray cans. It makes drilling the .039" balance hole for Sonnax pressure regulator valves a breeze.
Watch the video to see how easy it is to make a vise and the basics of valve installation. Click here to read the step-by-step instructions.
A performance torque converter is highly specialized based on the performance characteristics of the specific vehicle. Sonnax has several levels of kits to ensure ...Read More
GM 6L80 and 6L90 gas-powered applications that use a full-size torque converter often have engine modifications for increased output, towing heavy loads, or both, ...Read More
January 30, 2018
Note: 6L90 Early-style ('10-earlier) also have the exhaust slots like shown above.
Look for machined-down boss (A, B, C or D) on the upper casting. Generally, if the A boss is machined down, this indicates an MYA/6L45 (see chart below). This identification system is not foolproof, as some valve bodies do not have any bosses machined down.
BMW early versus late applications have a separator plate variation in the converter circuit. At this time, there are no known year breaks or external identification features that can be provided.
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March 09, 2015
Sonnax High Performance Product Line Manager, Gregg Nader, delivers an in-depth look at four popular GM 6L80-series transmission upgrades and repairs. Featured products include the heavy-duty 4-5-6 clutch apply piston kit, high-strength pump slide spring, proven line pressure booster kit and award-winning Zip Kit®.
