Automatic transmissions use the ATF fluid as a coupler in the torque converter. Because a manual transmission doesn't use fluid as a coupler, it doesn't have as big an issue with overheating as an automatic does. If heating up fluid does become an issue, it is a good idea to use some sort of finned aluminum PTO cover like the ones sold by Gear Tech Heavy Duty (601.899.9831, www.geartechhd.com). These covers also have a port for a temperature gauge, which wouldn't hurt.
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