What is the benefit of getting a 9 inch rear end? I have a Mustang with a swapped Boss 302 with Performer Edlebrock Carb and Intake. Car was originally a V6. My problem is the RPM's are high where I can't do any highway driving at 75mph due to me not wanting to overheat or blow my motor. So will getting a 9 inch rear end help me?
1969 Ford mustang 9inch rear end?
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