M30b35 swap compatibility
Posted: Wed Apr 15, 2026 9:32 pm
Hello
I have been perusing the M30b35 swap FAQ page for a long time and I am finding a couple pieces of information that are either not quite well presented or does not have information available.
I am currently swapping a 91 m30b35 into my 77 530I after my transmission and engine have both mysteriously died. I have already rebuilt the M30b35 along with adding a turbo for some extra power and sourcing a G265 transmission to pair it with.
one foremost question and concern. now that I am about to swap it and I am pulling the engine bay apart, is brake booster clearance a concern? Has anyone had any fitment concerns with the stock brake booster, and if so, how did you resolve it?
I’m really hoping I don’t need to get a different booster but if it turns out I need to, so be it.
Thanks so much!
-Justin
I have been perusing the M30b35 swap FAQ page for a long time and I am finding a couple pieces of information that are either not quite well presented or does not have information available.
I am currently swapping a 91 m30b35 into my 77 530I after my transmission and engine have both mysteriously died. I have already rebuilt the M30b35 along with adding a turbo for some extra power and sourcing a G265 transmission to pair it with.
one foremost question and concern. now that I am about to swap it and I am pulling the engine bay apart, is brake booster clearance a concern? Has anyone had any fitment concerns with the stock brake booster, and if so, how did you resolve it?
I’m really hoping I don’t need to get a different booster but if it turns out I need to, so be it.
Thanks so much!
-Justin