904 Clutchflite

FredS said

(which in effect this mimics like an applied clutch in a converter)

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This is incorrect..Lock up clutches in torque converters do not have torque absorbsion springs like are found in clutch friction plates. Having said that, think about the shock loading that trans gets when you shift at 7000rpm with a top quality converter and a manual valve body..
The two factors to consider are:
1) power through the trans
2) gear shift firmness/ overlap
So, don't go crazy with the power and don't go getting the box to shift like it's getting hit with a sledge hammer.