Diff Swap R200 for R180

The R200 is 3.7, the R180 was 3.9 and I did confirm this by a mechanical test i.e. chalk marks on all flanges and turning a few times then calculating the figure.

Next thing is to check the speedo which should now be more accurate ( '81 280ZX gbox ). What tyres does a standard 280 use?
 
The 280ZX gearbox speedo drive pinion is a match for the 3.7:1 diff on 195-70 14 tyres.
 
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