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Truetracs have bias ratios (not gear ratio--that's different) ranging from about 2:1 to about 3.5:1. I don't know, however, if more than one ratio is offered for a particular axle.
The 3.73+ and 3.53- numbers relate to the gear ratios they work with, doesn't relate to the bias ratios that Timber mentioned.
At any rate, they are gear/torque operated. So, if you want them to engage as gently as possible, just be as easy on the gas as you can. The more torque they get, the harder they lock. Really though, they are probably the most gentle locker available because they are really just very strong limited slips. But, because they use worm gears instead of the clutch discs, they hold under much more torque and will not wear out like a normal clutch-based limited slip.
yes, it's a gear-based LSD. they use worm gears instead of clutches to apply friction to lock the two shafts together. so while it's a lot stronger than a normal LSD, it will let the tires spin (but, if you apply a little brake, it'll keep them locked).