[77newell]

The function of the torque converter, aka converter, is to multiply engine torque delivered to the wheels when speed is modest for the current gear and a lot of throttle is input. When active, the torque converter is using pumping vanes to sling fluid through stator vanes to turbine that receive this high speed fluid and convert into torque at the entry to the transmission. All that shooting and sloshing of fluid heats it up. If, with the Jake active, the transmission has the converter active similar heat will be generated.

If it were me, I would try to ensure my converter was locked up when using the Jake. Honestly, I've never paid any attention to this yet, but I probably will from now on.