What effect does a larger or smaller diamter have?

From what I am told, (*In general since there are alot of variables to contend with) that a stall converter of approx. 2600 - 2800 will still act reasonable if not close to a stock converter unless you hit the gas pedal hard.

Having a converter stall @ 3200 - 3600 will have a soft feeling down low and etc... and on up the RPM range for each converter stalling higher and higher. The above recomendation for Dynamic is about the best you can do since if I was to list the top 5 converter makers for performance applications, they would be in it.

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i can tell ya my dynamic 9 1/2" converter that is a 3800 stahl acted stock on the street. when ya mashed the loud pedal look out and hold the hell on... :). like ya said its all about how well its matched to your combination. i ordered mine for my combo. had 3.91 gears in the car at the time and it worked great. now if i took that exact same converter and put 3.23 gears in my car then it would have slipped down low. the new converter technology is awesome. in the old days anything over a 3k would suck on the street. no now. its awesome. ya get the best of both worlds.

i would call:

dynamic
ptc
ultimate

get opinions from all three and go with the one you feel most comfortable with... a converter can make or break your combo.