- Oct 15, 2019
Hey,The 45BZ come with all N55 cars so far I know, mine came from a F20/F22.
The 53BZ can not improved, there are no parts or spare parts on the marked. The 45BZ can hold enough power/torque, it is also an S55 engines with another bell housing. And there are synchron rings as spare parts on the market if there are worn.
I'm driving E92 335i N55 and my gearbox is GS6-45BZ - THD4. Unfortunately my first gear pop off every time and there is no gearboxes listed for sale.
So I need to swap my gearbox with Diesel version. What do you think guys, should I take the different gear ratio into account? Is this a big problem?
I won't find any parts for sale tho