FMJ caliper interchange questions

Mopar92 said

73 up K with ARB. 73 up FMJ setup. Thanks

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That's easy. You can use all 73-76 A-body parts.

Although the later FMJ calipers that Cass recommends will have a larger caliper bore than the 73-76 A-body calipers. So using the later calipers will increase the braking power in the front.