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      05-17-2017, 12:03 PM   #1
cficare68
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Will a N54 GS6-53BZ trans work on a N55?

Ive been searching for the better part of a week now and can not get a direct answer to this question. Long story I lost 1st gear in my transmission on my 2011 135i. The car will go into gear and start to move forward but will throw it out of gear. 2nd threw 6th and reverse works great. Which leads me to believe ive damaged a bearing internally or chipped a tooth off of first.

My first option was to have it rebuilt but upon researching it appears that bmw has decided to be greedy and not sale the internals to these trans. Which has left me with two options. Option A. A used trans which will run me 2000 to 2900 dollars. Or option B a new trans from BMW for around 3600.

So im now left wondering if i were to get a n54 trans (which is more than half the price of a n55 trans with more availability) would it work. From what i have read the belt housing should bolt up with out an issue cause on the 4 cylinder and 6 cylinder motors bmw has been using the same bellhousing since the 70s. Also with the 1m using a n54 motor and a n55 trans i would assume the input shafts would be the correct spline count as well.

Does anyone know if in fact if it would be a direct fit? Cause i can seem to find a direct answer. Just bits and pieces that there is a possibilty of it working.

Thanks in advance.
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      05-18-2017, 07:16 PM   #2
cficare68
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Really glad this forum is so helpful!
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      05-18-2017, 07:19 PM   #3
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No one here works for you and is sitting around waiting for questions to come in to answer. If you're not getting an answer, either the person or people who know haven't seen this post or no one knows. I'm also guessing you have already conducted a thorough search.
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      05-19-2017, 08:54 AM   #4
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Also I will suggest you to direct your question to the 135i forum you will have a better chance to be answered properly.
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      05-21-2017, 09:08 AM   #5
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I believe it will bolt up to the bell housing but the transmissions are different lengths. This may affect the shifter position/linkage (you might need N54 trans shifter linkage + associated parts) and also a new prop shaft to the rear diff.
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      05-28-2017, 01:44 AM   #6
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By the time you do the conversion it will cost you the same

The new gearbox you get from bmw comes with m4 internals and is way stronger than your original box

When I got mine from bmw and done a check on the s/n, it matched to an early m4 box

the old 135i box is light years behind the new box in terms of smoothness, cold shift and general driving. The difference is like jumping out of a car into a truck

Our gearboxes have a dry sump type system in them which uses 1.5 litres max and lubricates the gears better the the oil filled original gear box that runs 4 plus litres
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      10-01-2017, 05:00 PM   #7
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I can relate to that, N54 manual box is very rough. But it is also very strong, so balances things. Doesn't take 4 plus liters tho, something like 2 liters.
If i'm not mistaken you broke your gearbox right ?
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      10-01-2017, 05:16 PM   #8
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Its what the dealer said but they get things wrong all the time
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      06-23-2021, 07:54 PM   #9
cficare68
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Quote:
Originally Posted by martymil View Post
By the time you do the conversion it will cost you the same

The new gearbox you get from bmw comes with m4 internals and is way stronger than your original box

When I got mine from bmw and done a check on the s/n, it matched to an early m4 box

the old 135i box is light years behind the new box in terms of smoothness, cold shift and general driving. The difference is like jumping out of a car into a truck

Our gearboxes have a dry sump type system in them which uses 1.5 litres max and lubricates the gears better the the oil filled original gear box that runs 4 plus litres
Ended up doing the swap. Cost me $1000. Noticed zero differences between the smoothness of shifting the trans.
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