leaf spring interchange 7 1/4 to 8 1/4?

67Dart273 said

You'll need different shock plates and U bolts

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The 7¼ has 2.75 inch axle tubes. All other axles have 3 inch tubes. This will require new clip bolts (u-bolts and nuts for a 3 inch tube) and shock plates for a 3 inch axle.