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In a "standard" leaf spring rear axle arrangement the axle is attached to the springs, shocks, and the drive shaft only. Where does most of the thrust from the wheels go?
 

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thrust

the thrust is transferred thru the leaf springs. because of inertia the axle will try to stay in place and rotate. when the springs start ot bend and match the resistance of the twisting force then the wheels start to turn. also the rubber bushings in the spring eyes compress. The reason racers use ladder or traction bars is to eliminate all that rotation and compression. .. with weak shocks or where they are mounted you can get a harmonic movement or po-go effect and the rear end will bounce. the 50 's style single traction bar was effective when the spring bushings were changed to be stiffer and the spring leaves had additional clamps. depending wher ladder bars are attached to the frame you can also get some front end lift.
 

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this is called axle wrap up and less of you have then the quicker power is transferred to the ground

thi sis why ladder bars and 4 link is used

because it prevents wrap up and makes for quicker launches

good luck
 
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