Rear spring eye contacts frame

twofosho said

If the springeyes are laying against the frame rails, the springs are too long/short and the frame brackets need to be moved fore/aft to get the proper angle on the shackles to allow them to work properly. Shackles long enough to mount at the proper angle and get the springs off the frame rails could be detrimental to high speed handling and/or launching the car.

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X2

I'd say the location of the rear shackle tube going through the frame rails is located incorrectly. Sounds like the upper spring eye needs to be further back on the frame rail. The rear shackles should be angled so the upper holes are slightly forward of the lowers. From your description, it sounds like yours have the correct lean but the angle is too great. Look at a stock Mopar leaf spring for reference. Relatively short shackle length but the spring eye does not contact the frame.