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View Full Version : Which is better (IYO)


bat-stang
03-16-2007, 12:51 PM
Road racers, open trackers, cone carvers one and all--can we help a Brother out: In your opinions, which is better: Lower control arms with spherical bushings on the axle end or the chassis end? (I have excluded our drag racing brothers solely because this application is more along the left turn/right turn type of toys.) Guidelines: This is assuming that the vehicle in question has aftermarket lowers and the driver actually desires sperical bushings on his car:D .
Thanks--If this is in the wrong forum, forgive me; looking for South Central responses primarily.

Batman

Levi
03-16-2007, 04:11 PM
At the axle end: I use a Teflon-lined spherical bearing to provide the greater angular motion required to prevent suspension bind. This also positively locates the rear axle.

The MM Heavy-Duty Rear Lower Control Arms utilize specially designed 3-piece urethane bushings at the chassis end. These bushings have a hard center section to prevent fore and aft deflection, and softer outer sections to allow the angular motion necessary to prevent bind. This design, with softer outer urethane sections, prevents torque-box damage due to binding of the lower control arms. At the axle end, we use a high quality Teflon-lined spherical bearing to precisely locate the rear axle. Unlike the other bushing types listed above, a spherical bearing allows freedom of motion for both pivoting and angularity. As with our 3-piece urethane bushings, this freedom of motion improves handling over other styles of bushings, and prevents damage to chassis components. We place the 3-piece urethane bushing at the chassis end, rather than at the axle end, for two reasons. First, this reduces the amount of noise, vibration, and harshness (NVH) that is transmitted into the chassis. Second, because the spring is mounted to the control arm and the chassis, it is best to keep the control arm and chassis from getting too far out of line with each other. If the spherical bearing is placed at the chassis end of the control arm and the urethane at the axle end, the control arm will tend to stay in alignment with the axle. This would cause the spring to arc sideways with body roll, and change the effective wheel rate.

bat-stang
03-16-2007, 04:19 PM
Thanks for playing, Levi1 I noticed that a couple of companies have this set up reversed and for some reason I remembered reading that the eurathane/delrin/del-a-lum bushing on the chassis and the spherical bushing on the axle was correct. And if the other way around is INcorrect, what is the logic or perhaps there is a greater purpose...Any one else?

93KingCobra
03-16-2007, 06:43 PM
+1 w/ Levi....