what torque converter with my 727?

[ctjeepman]

I am trading some electrical work for some free transmission stuff and I was asked what tc I have so he can match it up? Does anyone know what he means? It's still in the truck so I can't just pull it out and show him the one that is in there. This is for my J20

[Chevelleguy]

He may want to know what stall speed the converter is. Put it in drive with the brakes on and a tach hooked up. Give it as much gas as it will take without spinning the tires then note your engine speed. That is your stall speed.
He may also want the diamiter,11in.,12in.,ect.