[Darren Boyle]

Yep, large diff bearings and outdrives, plus I would suggest using 0 degree hubs too if possible.

The reason X-Factory have not changed is that it would be too big a deal and also make all the older stuff redundant. To fit the "wider" metric B4.1 diff they would need a new gearbox case, new chassis (since the wider gearbox would not fit in the rear cradle section) then that presents problems with the rear geometry etc which just makes it not possible. Although the B4 is no longer made, there are still LOTS in circulation that ould be converted, most peopele who have brought a B4.1 have done so to run it as it is (an AE rear motor car), not many will have brought it to convert straight away, if they were, then they would buy the XFK021 X6 Sq Entire Car instead.

You will also see that the prototype X7 is running the same diffs and the long term plan is that X-Factory will make these diff halves themselves and they will be included in all kits or conversions that will require them.

This way X-Factory owners of an X6 or new X7 when it arrives will only have to carry one type of diff and parts and it will fit their 2wd, as well as front or rear of the 4wd too....