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The stock trans is designed to shift soft, the valve body basically feeds the fluid to the Clutch packs/band and accumulators in a Y.
The clutches/band slowly get a apply pressure as the accumulator bottoms in a slide-bump fashion that makes the shift comfortable. This is basically sliding it into gear, turning up the power simply eats the material when it slides, so shifting under power at even 400 HP will eat the trans.
The apply pressure is also too low for over 400 HP and has to be increased, similar to a stronger pressure plate in a stick application. Over 400HP the trans should also have better material if you want it to last long, also more friction plates should be added to support more power.
The higher the power, the more that is required to hold the power, especially during full power shifts.
Several custom parts are needed to apply more pressure to the clutches/band on top of increasing line pressure.If you use your new convertor in a stock trans with higher power, the material from the clutches falling apart will get into the convertor. You will need to have the convertor cut open, cleaned, lock up clutch inspected and likely replaced, and rebalanced before running it with a new built trans.
The line pressure of the stock trans will not supply enough pressure to the lock up, so the lock clutch clutch will likely need to be replaced if run in a stock trans with high power.
If you install the convertor into a new trans after killing your trans without doing anything with it, the convertor will pump clutch material into the new trans and cause the valve body to bind and kill the new trans.
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