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The Ford T/H mode changes the upper shift points on the Torqueshift transmission when accelerating, and helps with engine braking when going downhill. You should practice with it to understand just what it does and is capable of doing. When in T/H and beginning to climb a hill/grade, it will allow the trans to downshift earlier as you increase gas pedal pressure--the trans will climb the hill without the T/H mode, but will lose more speed before downshifting, which will end up having to add more throttle to make up the lost speed. When beginning the downside, pay attention to what is going on with the rpms/speed--when the trans senses you are gaining speed without pedal input, it will downshift one gear; if it keeps accelerating, it will eventually downshift another gear if needed. At any time, if you apply the brake and the T/H is engaged, you will probably note a downshift, maybe another if speed increases. Don't worry too much about the rpm increase--the V10 will take 5200 without damage.
Driving a MH of any size dictates that you learn the transmission gear changes/rpm differences and when they occur, and also learn to anticipate the approaching up/downshifts so they don't bother you.
If you have the 5-speed trans, you can note 4 shift points on the tach, and another rpm drop when the torque converter lockups on accelerating. If it is a 6-speed, then 5 shifts before the lockup. The T/H mode also keeps the torque converter locked up when decelerating to reduce need for brake usage. Try this: drive around town on flat roads in T/H mode--and watch what happens as you approach a stop light slowing down--you should note several down gear changes and associated rpm rises. Eventually it will drop to first gear if you have enough space to let the MH come close to a stop without the brake.
It is an interesting computerized transmission and you need to learn how best to use it.
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