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Originally Posted by TyCreek
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To reduce the source of tail wag the front to rear yawning must be tamed. Twist/Yaw happens from bushing play and spring flex. Unlike so many other solid axle vehicles with a panhard bar from the factory, our E chassis doesn't have one. There is nothing other than the spring packs themselves to prevent side to side flex/shift. ...cut....
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I think it depends a lot on suspension type.
Track bars are common on solid rear axles when suspended by coil or air springs; where the suspension itself can't provide adequate lateral stiffness.
On the other hand factory vehicles with solid rear axles with leaf springs normally don't use a panhard bar (track bar) to prevent side-to-side suspension flex. Leaf springs are stiff laterally due to their geometry.
That's not to say that a track bar may not help some in reducing tail wag, but their disadvantages could outweigh advantages when used on vehicles with leaf springs. Ford may not use them on E-Series, but in fairness also don't use them on rear suspension of 2016 F-350 luxury pickups with leaf springs costing twice as much as an E-Series.