Though I would post up the process of the BW78 (R31 Skyline) Diff conversion. And the costs. Will update this as I go.
Nissan Pintara R31 Brakes - $60.00
Nissan Skyline Diff 3.89 ratio - $50.00 (Minus Brakes)
New Brake pads - $30.00
New Rotors $58.00 each @ Repco
Loctite - $8.00
Rubber Grease - $15.00 (For calipers)
Shortening and re-spline of long axle - $160
Hand brake cables - $310
This one hurt the walletStripped the calipers and washed them out with degreaser. Have re-used the rubber seals as these were OK, but have re-assembled with Rubber Grease. Putting these calipers back together can be a pain, but the link below was helpful. Have cleaned up and painted calipers so these are ready to go.
Have prepped the ends for the axle housing where the brakes bolt on. Need to cut the housung tubes to the correct length and re-weld it together. Waiting on some pipe to slip inside the tube before I fully weld it, but looks like wont get this before xmas.
Skyline brake info