Rear Trailing Arms
#28007 from American Sedan Committee · Rule change · TB 20-02 (2020-02 Fastrack)
In AS, Section 9.1.6.4.d.5., change as follows:
"Bushing material is unrestricted except that bushing material must be at least as stiff as stock (i.e. equal
or higher durometer rating). “Air”, foam or other soft materials that render the control arms ineffective,
are strictly forbidden. Control arm to spindle/knuckle ball joints must be stock or equivalent
replacement. Ball joint may be welded or positively attached. Original unmodified lower control arms
(front and rear), and original unmodified front upper control arms must be retained. Vehicles with rear
trailing arms may replace OEM arms with tubular arms. Arms must maintain stock length and serve no
other purpose than locating rear axle assembly. Pins, keys, or weldment may be used to prevent the
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rotation of alternate bushings, but may serve no other purpose than that of retaining the bushing in the
desired position."