Heather’s 67 Mustang Coupe to Fastback conversion project.

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A cheap axle swap that is easy to find for 67-68 mustangs is a ford explorer rear. It's the best deal, many came with 3:73 and limited slip, and early ones came with drum brakes others came with factory rear disc. The width is perfect no cutting, you will have to move the axle perchs.
Mike