Sambo,
It appears the R33's has the 4.3 to 1 diff ratio the same as the R32.
The spec's are on the attached web site
http://justskylines.com/skyline/know...ech_specs.aspx
Two Harrison cobras that I know of changed the R32 diff for S15 diff (3.7 gears) and now they can use first gear and the car is a lot quiter at highway speed. One used a T56 box and the other was a T45.
Warren