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See Chinese contents: GB/T 39899-2021 GB/T 39899-2021: The technical specifications for remanufactured automotive components -- Automatic transmission
This Standard specifies the terms and definitions, disassembly, classification and cleaning, inspection, testing and repair, assembly, performance requirements and test methods, inspection rules, marking and packaging for remanufactured automatic transmission. This Standard applies to remanufactured hydraulic automatic transmission (AT), dual-clutch automatic transmission (DCT), and continuously variable automatic transmission (CVT). It can be implemented for remanufactured automatic transmissions of other power-driven vehicles by reference.
