Hopefully something simple like the center bolt in the spring pack. A bolt runs through the main leaves and into a recess in the axle. Take a look at where the axle is in relationship to the center of the spring pack. Measure the passenger side from the center of the axle to the rear perch, compare to the drivers side.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
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