The whole purpose is to transfer torque from motor to trans,by means of fluid pressure and will suit the bill as long as the fluid pressure matches motor torque applied,at launch or thruout the run?.Where in that process wouldn't a 2500 work? Are you saying that I could use more at the higher rpm levels,I don't know because I thought once a converter did it's thing it was constant throughout the rpm??? Cause rpm launch,with 411 gears and Oddlots brake and my cam/heads may not launch any higher.Now,I admit,once the vehicle has overcome inertia and is up in the power,I havn't a clue where the converter has gone?