Want to put a 2F into a BJ with the 3B and H41 what do I need to make the 2F mate up?
The H42 (the US 4 spd) and the H41 (non US 4spd) are interchangeable. You just need to use the 21 spline clutch disc. I'm not sure about the bell housing, but I think that they use the same one. The H41 4 spd was installed behind the 2F in the non US markets.
The main difference between the two is, the H41 has a lower first gear.
OK, so what exactly is the diffence between F series and B series input shafts?
So, will the input shaft from the H42 fit in the H41?