GM releases fix for harsh shifts in Chevy Trax and Buick Envista crossovers. Dealers are to replace TEHCM and valve body in 6T40 transmissions.
The Hydra-Matic eAssist 6T40 (production code MHH) is a six-speed automatic transmission produced by General Motors for use in electrified front-wheel-drive vehicles with a transverse powertrain ...
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