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GM offered variable-pitch TH400 transmissions with either an 11- or a 13-inch torque converter. While both have a “low stall” speed of 1,800 rpm, the 11-inch converter has a “high stall” speed of 2,800 rpm and the 13-inch unit stalls at 2,400 rpm with the fins closed. Phoenix set us up with an 11-inch converter. View Related Article
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