Best Aftermarket Suspension Set-up

tonysrt said

If torsion bars were so great, why did Ram Trucks go to Coil springs? I'm no engineer, but I think the length of the bars in some way make movement further from the front end to the rest of the car. Coil springs are limited to insolated control arms with rubber bushings.

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I don't know the answer to that but the need to implement catalytic converters close to the exhaust manifolds pose a problem. The extreme heat from the converters are not good being so close to the torsion bars, hence the entire reason for the FMJ series cars having the transverse torsion bar design.
To make torsion bars work in them, the bars would have to be spaced further apart which affects the length of the lower control arms or front wheel track.