Yep,
The B4 / B4.1 & B4.2 gear boxes are different, but easy to tell apart.
The old B4 gear box is narrow compared to the B4.1 /B4. 2 gear box.
The B4.1 / B4.2 gear box is wider so it can take the gear diff.
You also need the newer rear t-plate for the B4.1 / B4.2, gearbox is wider, so t-plate has a bigger gap for the gearbox to sit into.
MiCk B. :-)
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