C4.1 confused and struggling !

[andys]

I'm on with building my C4.1

As well as missing spacers for the,lipo, missing bearings and screws, I've also had to dremmel the gearbox as per Chris Longs problem with the layshaft fouling the gearbox inside.

Now I'm struggling with the diff.

I'm converting my X6 to the C4.1 and it looks like the diff / bearings drop in as they are, why do I need different out drives & bearings ?

I've bought some SC10 out drives (no. 9852) but the bearing kit I got was B4, not B4.1....
So I'm missing the b4.1 bearings, can't I just drop my diff in as is, it looks to fit fine - confused, help