That info is questionable.
A: There was only one year of the 260z and the 280 started in 75
B: That info shows no r200's which would be found on most cars i think 75-76 on
Anywho heres some hitachi diff info as well:
R160, 510, WRX
Ratios 3.90. 4.44
No LSD on Datsun, Subaru Clutch type
R180, 240Z, 260Z, 280Z, 280ZX
Ratios 3.36, 3.545, 3.90
No LSD
R180, Nissan 720 4x4 pickup (early 1980s) front diff
Ratios 4.11, 4.38
No LSD
R180, 810/Maxima late 1970s and early 1980s
Ratios 3.70 and 3.90
No LSD
R190, Long Nose 240Z 432R
Ratios 3.90
two pinion clutch LSD
R190, Long Nose Nissan Motorsports
Any Ratio
four pinion clutch LSD
R200 long nose, 280Z, 280ZX, 300ZX
Ratios 3.36, 3.545, 3.70, 3.90
LSD April 1987 and newer turbo
R200V long nose 1, 1988 SS
Ratios 3.70
LSD Viscous
R200V Short nose, 5 Bolt ouput shafts (240SX)
Ratios 3.90, 4.08
LSD Viscous
R200V Short nose, Q45 1989-1996 , 6 Bolt ouput shafts
Ratios 3.545
LSD Viscous
R200V Short nose rear of a R32 GTR skyline, 5 bolt output
Ratio 4.36
LSD clutch type
R200V Short nose, 300ZX NA, 5 Bolt ouput shafts
Ratios 4.09
LSD Viscous
R200V Short nose 350Z, 6 Bolt ouput shafts, Single bolt on rear cover
Ratios 3.36, 3.545
Open Base, LSD Viscous on other models
R230 Short nose, 300ZX TT, 6 Bolt ouput shafts
Ratios 3.69
LSD Viscous
R230 Short nose, Armada, Large 6 Bolt ouput shafts (bigger than 300ZXTT)
Ratios 2.946, 3.13
No LSD