Most cars with sprung rears have one or both of these problems . (1) Too much
rear roll stiffness (to overcome the effects of drive shaft torque) or (2)
unequal rear wheel loading under acceleration (due to drive shaft torque) .
Both problems make a car more spin prone . Normally the remedy for oversteer
is add front roll stiffness or reduce it in the rear , not easy when rear roll
needs to be high . Independent rear suspension is one solution . A simpler fix
; use a single torque arm a little to the right of the drive shaft .The offset
needs to be the torque arm length divided by the ring & pinion ratio . With
this design the torque arm exactly cancels the undesirable effects of drive
shaft torque , wheel loading stays equal under acceleration or deceleration
and roll stiffness can be as desired . The only drawback is wheel loading is
unequal under braking . Only the torque arm should resist axel torque (single
link on each side) and only the single links should locate the rear front to
rear . The front of the torque arm needs to be free front to rear (slot or
vertical link) so there is no torque arm arc to fight with the side link arcs
. Hope my description is clear enough . John
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