Differential - Ratios
Skyline:
Manual (lsd and open) : 3.7
Automatic (lsd and open) :3.89
Pintara (not sure on manual) : 4.11
GTS2 (both auto and manual) : 3.89
Speedo is driven off the gearbox, therefore putting a manual gearbox with an auto diff will put the speed out 5% (speedo will read higher than actual car speed).