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How well traction bars work is directly related to the amount of thought and effort in tuning them. Just slapping a pair on is only the first step. Clamping or unclamping the springs and trimming the snubbers to set preload must also be done for them to work well. But at least you can set preload from side to side to prevent the torque from trying to pick up the passenger side tire, which helps traction and helps keep the car in a straight line. If you can tell me how to preload one side with a pinion snubber, I'm listening. That is, how without using SS springs that are mismatched from side to side, ride unnecessarily hard, and affect normal handling.
Leaf springs by nature aren't suited to transmit torque - by the time they are stiff enough not to wrap up they are way too stiff to let the back work. A softer spring package with properly tuned slapper bars can work extremely well with a little tuning. And no, I didn't forget about shocks; that's a whole other topic. 
Post of the thread right there. 
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