<div class='quotetop'>QUOTE(SCIV &#064; Feb 8 2007, 12&#58;11 PM) [snapback]82657[/snapback]</div>
They have more surface area (think like the top of a piston, IE they are larger), which allows more fluid to push against it. This allows the increased pressure to give increased clamping.

I am not an expert, but I think that is the jist of it.
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so basically its like a small shift kit? is it bad for the trans???