Oil gets hot going over relief in a hydraulic system, So if there is a mechanical relief in your transmission that may be a problem. I think the computer controlled transmissions just control the pressure with no relief. High line pressure is only commanded when needed so fuel mileage is out the window at full throttle anyway. It may cause extra load when not needed for normal driving.
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02 Saturn L200 5 speed- 265k miles
84 Gmc 6.5 na diesel K30 4x4, TMU
2006 Lincoln Navigator, 215k miles
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