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I have a '72 with auto trans which originally had a 3.54:1 rear which I have changed to a 3.9 from a Nissan 4x4 (also a r-180). Can someone help with speedometer recalibration? What pinion to replace with? My Nissan Motorsports Catalog only lists replacement pinions for trans. F4W71A, FS5C71A/B, AND F5C71B