AutoBahn F-100

[RobNoLimit]

Hmm, here's what I know about trailing arms. Well, a bit of it anyway. One way or another, there has to be some 'Twist' in the arm, if you want the axle to rotate freely. By that I mean, 'tip' to one side. We want to use sway bars, shocks, springs, and roll centers to control and exploit body roll in a corner. - Not suspension bind. The OE truck arm has a fixed bushing and although it is rubber, it doesn't have much twist. But, the OE style I-beam construction does twist, pretty easily. As far as the OE goes, the twist is OK. Welding the arms, boxing them and adding urethane bushings (all the current hype) may be better for drag racing or high speed open track stuff, but will yield a stiffer ride, and cause the rear suspension to be a little less compliant on the street and short coarse. IMHO, round or square tube trailing arms with fixed urethane bushings may be the worst. No twist in the arm or the bushing. We use a square tube arm to reduce torque flex during acceleration and braking, coupled with a urethane bushed "Monster Ball" adjuster to allow plenty of twist, for full axle rotation. It's the best approach we have come up with.