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Since there is still a lot of stuff about these not known exactly and many confusing topics, thousand of pages and myths, I will try here to make it easier. If anyone has additional information or something is not right, please post, then I will modify the 1 post. This is for stock factory transmissions only, NOT competition ones. There are A, B and C types transmissions ( C was never used in Z cars so I will not add these here ) Update 9/7-21 : Also the 4.11 ratio R180 was not used on Z cars ( correct me if I am wrong ) Also not sure if 3.90 was used in the USA on the 260/280Z and ZX So far I have: Nissan S30 Fairlady Z Japan till 1978: F4W71A manual F4W71B manual FS5C71A manual FS5C71B manual 3 speed automatic 3N71A 3 speed automatic 3N71B R180 Differential, possible gear ratios available: 3.36 / 3.54 / 3.90 240Z: Datsun 240Z USA and Canada F4W71A manual F4W71B manual 3 speed automatic 3N71A 3 speed automatic 3N71B R180 Differential, possible gear ratios available: 3.36 / 3.54 Datsun 240Z Europe, UK, rest of the world FS5C71A manual FS5C71B manual 3 speed automatic 3N71A 3 speed automatic 3N71B R180 Differential, possible gear ratios available: 3.54 / 3.90 260Z: Datsun 260Z USA and Canada F4W71B manual FS5W71B manual 3 speed automatic 3N71B R180 Differential, possible gear ratios available: 3.36 / 3.54 / 3.90 Datsun 260Z Europe, UK, rest of the world FS5C71B manual 3 speed automatic 3N71B R180/R200 Differential, possible gear ratios available: 3.54 / 3.90 280Z: Datsun 280Z USA and Canada F4W71B manual FS5W71B manual 3 speed automatic 3N71B R180/R200 Differential, possible gear ratios available: 3.36 / 3.54 / 3.70 / 3.90 ----- ------ ----- ------ ----- ----- 280ZX: Datsun 280ZX USA and Canada F4W71B manual FS5W71B manual 5 speed Borg Warner T5 3 speed automatic Jatco 3N71B R180/R200 Differential, possible gear ratios available: 3.36 / 3.54 / 3.90 Datsun 280ZX Europe,UK, rest of the world FS5W71B manual 5 speed Borg Warner T5 3 speed automatic Jatco 3N71B R180/R200 Differential, possible gear ratios available: 3.54 / 3.70 / 3.90 Nissan S130 Fairlady Z Japan: FS5W71B manual 5 speed Borg Warner T5 3 speed automatic Jatco 3N71B R180/R200 Differential, possible gear ratios available: 3.54 / 3.70 / 3.90

I opened a diff I just got with a lot of parts and it has the following stamped markings on the ring gear: 35 X A C 5 - 11 Anyone have a clue as to the ratio?