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05-19-2017, 11:18 AM | #1 |
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Is it possble to use the GS6-53BZ (n54 trans) 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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06-16-2017, 07:38 PM | #3 | |
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The main difference between the two transmissions is the input shaft inside the trans. On the N55, the transmission has a male shaft while the flywheel has a female pilot bearing. On the N54 transmission, the flywheel has the male shaft, and the transmission holds the female pilot bearing. So theoretically, you would be able to run the N54 transmission, but you would need to find a 6-bolt N54 flywheel with the male shaft (and a couple other small parts for the shifter.) That's why I'm in search of one right now, I'm trying to swap my N55 auto trans. to a manual and I bought a 2009 N54 manual trans. to do it with. |
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12-28-2018, 05:12 AM | #4 | |
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01-01-2019, 12:12 PM | #5 |
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Pilot bearing is easily pressed put of the n55 flywheel no issue there at all... the issue is the driveshaft is a different length. I've also read the shifter doesnt sit at the same position anymore but not sure on how true that is... the shifters are interchangeable between n54 and n55. My guess is that the selector rod is different on some cars like xi and it's not actually the shifter that's the issue.
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01-07-2019, 06:26 PM | #7 | ||
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01-13-2019, 10:41 PM | #8 | |
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01-13-2019, 10:45 PM | #9 |
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Yes i picked up the transmission today from my friend. The trans came with the shifter arm assembly as well and just ordered the flywheel about an hour ago. So im playing the waiting game now. Looking online for the n55 trans the cheapest i could find the transmission for was $2,000 with 120,000 miles on it. Thus far into this swap i a $800 bucks and all that i have left is the trans fluid.
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01-14-2019, 07:25 AM | #10 | |
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Manual drive shaft transmission L=1385MM 1 26107614420 Driveshaft, dual-clutch transmission L=1353MM 1 26107614424 N54 (GS6-53bz) Manual drive shaft transmission L=1371MM 1 26107567933 Drive shaft automatic transmission L=1373MM 1 26107574680 Who lists them as being the same? There might be enough slack in the yoke to pull the N55 driveshaft the extra 14mm but you would have to figure that out yourself. |
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01-14-2019, 08:39 AM | #11 | |
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Last edited by cficare68; 01-14-2019 at 10:40 AM.. |
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06-14-2019, 04:53 PM | #12 |
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Still working on this swap. Just been dealing with no first gear driving around on the stock trans. Haven't gotten a chance to go grab the n54 driveshaft yet but I think i might just try the swap with the n55 driveshaft. If the N55 driveshaft is 14mm longer than the N54 i don't see there being an issue with it.
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11-08-2019, 03:46 AM | #13 |
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Were you able to reuse your original driveshaft? I'm thinking about replacing my GS6-45bz with a GS6-53bz. My driveshaft comes out to being 15mm longer. So a similar difference in your situation.
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11-08-2019, 07:40 AM | #14 |
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Be better off trying to retrofit the zf8. Can't remember the designation of the unit that has been swapped in by others.
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