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Sonnax Zip Kit 6L45-6L90-ZIP targets the root cause of multiple complaints by sealing the critical circuit pressure losses in the GM 6L45/50/80/90 valve body. The ...Read More
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Sonnax Sure Cure kit SC-6L80-6L90 for GM 6L80 and 6L90 units is a comprehensive reconditioning package featuring the best Sonnax products developed to help rebuild...Read More
GM 6L80 and 6L90 transmissions often suffer failure of the 4-5-6 clutch assembly due to OE design shortcomings. Insufficient clutch piston-to-plate apply surface a...Read More
Sonnax chromoly turbine hub GM-HTCM-49HS with hardened internal spline replaces previously offered GM-HT-49HS.
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
The GM Corvettes that use the GM 6L80, 6L90 (300mm) torque converter often have engine modifications for increased output, which can quickly push the stock, single...Read More
Sonnax high-performance pump slide spring 104534-HD for GM 6L80 and 6L90 transmissions helps maintain consistent pump volume during line rise and at high-RPM opera...Read More
Sonnax piston plate GM-DA-17P, when used with solid, flat head rivets GM-RV-13, replaces failed plates in GM 6L80, 6L90 (300mm) converters. Steel-forged for ...Read More
GM 6L80 and 6L90 1-2-3-4 pistons commonly crack due to cantilevered stress on the cast material. The OE part has been through several revisions in an attempt to c...Read More
GM 6L80 and 6L90 transmissions often suffer failure of the 4-5-6 clutch assembly due to OE design shortcomings. Not enough clutches and insufficient clutch piston-...Read More
The output planetary assembly in GM 6L80 and 6L90 transmissions has a lube dam, or cover, that directs lube oil flow to the planetary lube feed passages. Over time...Read More
GM 6L90 extension housing bushings are prone to wear prematurely due to sub-optimal material composition. Restore normal operation and provide greater wear resista...Read More
Vehicles with GM 6L45, 6L50, 6L80 and 6L90 transmissions may have a number of TCC apply problems. Bore wear at the TCC regulator valve can cause no TCC apply or sl...Read More
The long planetary pinion pins in GM 6L90 transmissions are notorious for allowing the smaller gear to burn and seize due to lack of adequate lube. This often dest...Read More
GM 6L45, 6L50, 6L80 and 6L90 units often suffer from shift abnormalities caused by excess wear in the actuator feed limit (AFL) bore. This wear prevents proper reg...Read More
The output planetary assembly in GM 6L90 transmissions has a lube dam, or cover, that directs lube oil flow to the planetary lube feed passages. Over time, the lub...Read More
The GM 6L80 and 6L90 TEHCM houses the transmission control module (TCM), or computer. The eight solenoids are connected to the TCM via a lead frame, all of which a...Read More
A worn valve or valve body bore can result in incorrect pressures in the transmission, which may lead to poor performance or failure of the transmission. With the ...Read More
In GM 6L90 transmissions, the low/reverse sprag elements, end caps and retainer plates are prone to wear, while the race is often unaffected. This results in a bin...Read More
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
