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Re: spool rear ends advantage
In a 'regular' differential, the two axles are 'connected' by spider gears. These give the rear end the 'differential' action - allowing the rear wheels to rotate at slightly different speeds in turns. Power is transmitted to the side with the least resistance.
A spool is a solid casting or forging. Both axles turn at exactly the same speed. There's almost nothing to break in a spool, plus, power is transmitted evenly to both sides - so they are favored by drag racers. The downside is that the car is VERY difficult to turn. In a sharp corner, you can feel the rear end 'twitching' when the inside tire wants to turn fewer RPM than the outside one.
SL
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