Is it possible to convert??

ChrisPerry said

I'm curious, how does shackle length effects the life of the springs?

I know that long shackles can lead to handling problems, due to the possibility of the springs moving side to side, causing rear-steer.

Is it the side to side movement that destroys the springs?

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The long shackles tend to force Mopar leaf springs to sag past horizontal. This is likely due to the location of the strength on Mopar springs (forward of the axle). This puts a slight "S" curve on the spring.

My daughter-in-law's '65 Mustang has long shackles on it (my son put them on the shortest hole, though). Because Mustang springs are symmetrical they don't sag the same way and tall shackles will tend to raise the back end more.