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Answer: This term refers to a converter that contains an internal lock-up piston or device, either friction or mechanical. Transmissions such as TH350C, 2004R, 4L60 (700R4), 4L60E, 4L80E, AOD, AODE/4R70W plus others, use these methods of eliminating slippage for an increase in fuel economy. Older transmissions such as the TH400, TH350, C6, C4 ...
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