R31 Skyline Borg Warner 7.8 inch 28 Spline: Man=3.7, Auto=3.89
R31 Pintara 25 Spline: 4.11
VL Commodore (non turbo) 25 Spline: 3.45 lsd option
VL Commodore Turbo and V8 28 Spline: V8=3.08 (3.45 option), VLT=3.45 all with lsd optionional
VN-VS Commodore 28 Spline: 3.08
Falcons Fairlanes Fairmonts: Too many variants eg. 2.77, 2.92, 3.08, 3.23, 3.27, 3.45
Kaaz 2way part number DAG3820, Not always listed specifically for Skylines but the diffs are the same as Falcon EB-BA and Commodore VN-VS VT-VZ V6.
You'd be looking at a minimum $1500.