R180

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Fuji R180 differential is slightly larger, but significantly stronger than the R160 unit used in Datsun 510/610. These are both IRS diffs, and the cases are approximately the same size so swaps are possible with some modificationᴳ. The R180 case is slight wider than the R160 case. The big dog is the R200, but it is much larger.

180mm ring gear diameter
110mm inner diameter -1976
115mm inner diameter 1977- [stamped K] 

Factory fitted to Datsun 240Z/260Z/280Z, 280ZX Skyline 240K, and may Nissan models.

A Subaru R180 can be used but the axle shafts must be modified to suit the Datsun style.