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1973 Mustang Pinion Seal?????????

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jemoore24:
I have a 73 Mustang. It has 351 Cleveland. The rear pinion seal is leaking in the driveway. I called the auto store and they wanted to know if it was a 8 inch or 9 inch. It has 2:75 gears. Is their a way to measure this to get the right new gasket? Thanks jemoore

Thierry:
 Soaring posted all the information you need about the 8 inch and 9 inch rear end differences in the classic Mustang FAQ
In section: IX. DIFFERENTIAL AND AXLE

Soaring:
Yeah, it's an 8".  The 9's were in the K codes and the later models. 

rmodel65:
the big 71-73 car have 9 inchs a lot of the time

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