New converters are a far cry from the old ones.
Old 3000 stall converters would act like stepping on a marshmellow down low. Mushy, sluggish.
Well designed new ones are tighter when driving and still flash to a higher speed when you hit the go pedal.
Lots of guys go from old style 3000 stall, to a new 3700 stall and their highway RPM goes DOWN with the new higher stall converter.