Torque Converter Manufacturers/Builders
What does a Tight 4000 mean exactly Triple R? Loose to 4000, Then Tight or...
I'm a Stickshift guy so I've never had a TC made
Basically, tight versus loose will refer to size, internal components, and fin angles.
A converter shop can make a 4000 stall converter out of a eleven or twelve inch core, or an eight inch, or anything in between. An eleven inch 4000 will be a horrible piece of junk, because of the adjustments inside to make it sloppy. The eight will be quite a bit more expensive, but a far better converter.
As for loose or tight, if you use a small enough core, you can have it act tight, meaning drive more like a stocker, and still get good stall speed. For example, the eight mentioned above probably can be a tight 4000, or a loose 5800, depending on stator, fin angle etc. ( Remember, engine size, torque and horsepower has a HUGE effect on stall speed too. A 500hp 440 will stall much higher than a 500 hp 273)
For good info on how a converter works, and how they are adjusted, check out Hughes trans videos on you tube. Their one on torque converters is excellent.