That's interesting. The principle of using the engine coolant to cool the gearbox is not wrong but it probably needs a much larger heat exchanger to work well enough to avoid excess temperature. Surprising that the existing Bristol item is not enough, however, as the standard gearbox had no torque converter lock-up, and without lock-up the torque converter slip tends to generate quite a lot of heat. Maybe the radiator components are a bit furred up inside.
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