Commentary on Mopar XHD springs.

dartley said

Unless I am very much mistaken, the XHD springs are not the same as SS springs, which is what you are describing. The later are really drag only springs, while XHD is just higher rate and should be the same number of leaves right to left.

If you are compensating for unevenness of your leafs by adjusting your TBs, and you are running this on the street - well - that does not sound like a good plan to me ... but it's your nickel.

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You are mistaken,and twofosho is dead on with his assesment on the 340 xhd springs. Have the same pair on my Dart.There are two different part #'s. The right side does sit higher on them,and adjusting torsion bars to your perticular taste is a common practice.
(Rear right high,raise front left). Guys back in the day use to adjust the torsion bars with the driver in the car.When the driver would get out of the car, the front left seemed a bit high depending on their weight.