Hi, this is an extract of what I have posted on the FBEK forum which may be of help.

Attached is some details of the modification I will be making to a VN diff to suit my FB.

There is much information on this forum about this but what is often missing is the relationship between the wheel offset and the resultant track.
This will use 2 short side axles and cutting of one side of the diff housing to suit.

It shows
- FB diff and standard track with 6p offset wheels
- VN standard diff, VN track with 43p offset wheels (Commodore standard)
- VN diff shortened to suit FB track with 43p offset wheels

I will post some picture of the actual modification when the sparks start to fly and some details of some other modification including brakes etc.



http://s1122.photobucket.com/albums/l524/fbidek/?action=view&current=VnDiffMods2.jpg