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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
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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
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
The OE pump bushing in GM 6L45, 6L50, 6L80 and 6L90 transmissions utilizes a PTFE-impregnated load bearing surface to support large forces and survive dry-start co...Read More
Sonnax pilot GM-PI-21 comes standard in the following 6L80-series Sonnax performance converter kits: GM-RK-685, GM-RK-685WC, GM-RK-688, GM-RK-688WC. The pilot a...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 chromoly turbine hub GM-HTCM-49HS with hardened internal spline replaces previously offered GM-HT-49HS.
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 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.
’10-Later
Sonnax remanufactured valve body GM6L80L has been designed to address common issues, such as: burnt clutches; codes P0751, P0741, P0742; harsh TCC apply; bump, har...Read More
’06–’09
Sonnax remanufactured valve body GM6L80E has been designed to address common issues, such as: burnt clutches; codes P0751, P0741, P0742; harsh TCC apply; bump, har...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
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
Mid 2010-earlier GM 6L45/50/80/90 transmissions have a tendency to set a P0751 (shift solenoid 1 malfunction) code. One of the causes of this is the OE spring forc...Read More
The outermost spring retainer plate in GM 6L80, 6L90 (300mm) damper assemblies often cracks and fails. The OE material and stamping process create an inherent weak...Read More
The ideal upgrade for performance vehicles with the GM 6L80 transmission, Sonnax extreme duty 4-5-6 clutch hub and intermediate shaft 104680-45 guarantees maximum ...Read More
GM 6L45, 6L50, 6L80, 6L90 units may have TCC apply and release problems. Bore wear or a stuck converter feed limit valve can result in converter overheat, incorrec...Read More
An essential upgrade for any hard-working GM 6L80 transmission, Sonnax heavy duty 4-5-6 clutch hub and intermediate shaft 104680-36 guarantees maximum protection a...Read More
The rubber seals between the center support in the case and the machined surface of the valve body are prone to leakage over time. In GM 6L45, 6L50, 6L80, 6L90 tra...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
