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Instead of a differential that can unlock one side to let the wheels spin at different speeds, a spool is a solid link between the axles. No springs, no clutches, just a solid piece to put the axles in and the gear on.
Perfect for an all drag vehicle, a total biatch on the street!
Because when you do things like make turns, your inside wheel is rotating at the same speed as your outside. Your chirping tires, and a lot of people say it gets a bit hoppy.
Are you serious...when you make a turn in a diff car your inside wheel turns slower then the outside wheel, the diff allows this to happen, by unlocking, and letting the wheels spin at different speeds, with a spool...turning, and handle are very compromised because the above can't happen. There really isnt any point to a spool on a street car. Unless its a 7 sec street car...