is it true need info

It depends on the design of the converter as to whether or not you have to run it above the stall speed. There are basically 2 different types of converters. Ones that are termed tight stall converters and ones that are termed loose converters. Tight converters don't really slip much until you apply alot of torque such as flooring it. Loose converters slip pretty easily. You can usually tell pretty easy what design you have if you have to give it alot of gas to take off it's a loose converter and that's the type that will slip alot if you don't have the rpm's above the stall speed. A tight converter like i have in my car that stalls at 3000 works just fine running at lower speeds cause it don't slip much until I lay into it hard.

I will say that if it's only turning 2100 at 60 mph. with 3:23 gears you must have really tall tires or it's not slipping hardly at all cause my car has 28" tires and it turns 2600+ rpm at 60 mph.