GS6-53DZ swap to GS6-45BZ?

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bscsystem

New Member
Oct 15, 2019
2
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.
Hey,

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 :(
 

Chrysheight

Lurker
Nov 11, 2017
20
San Jose, CA
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.
Where can one find synchro rings for the 45bz transmission? I just purchased a used 53bz transmission to replace my 45bz, but if replacing the rings is an option, I'd probably like to stick with the 45bz transmission
 

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