If you have the proper install kit with shims there is NO difference installing any ratio or any brand. Any gear you choose will require the backlash adjusted and the pinion depth set to have the proper teeth contact. A gear install can be performed by most competent technicians within 2-3 hours with the proper tools (magnetic dial indicator and pinion puller and torque wrench) Don't be scared of a 3.90 just because Ford motorsports doesn't offer it.
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