Originally Posted by
Oranoco
It must be IB5 internals in the BC casing as the S1 ARB set up bolts to it. The IB5 does not have the castings for this. and the S1 can't use a normal cradle as found in the S2 without dithcing the ARB setup.
If I'm wrong I'll eat my hat.
yes it is using bc late front, but all the rest are ib5, like the gearset, double syncro, packed bearings etc..