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12-18-2023, 10:20 AM | #1 |
J
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Drives: BMW 128i
Join Date: Feb 2019
Location: Connecticut
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Manual Swap - 135i manual trans into a 128i -
Hi all,
I recently picked up a manual transmission from the n54 135i and I plan on tossing it into my 128i, which came as an auto. I want to keep my 128i auto 3.73 diff, so now I have to sort out a drive shaft. Has this been done before? I can't seem to find any info on how to deal with the drive shaft. Realoem gives me driveshaft lengths, but they're totals, and not broken down by front/rear sections. Are all the drive shafts the same distance from the trans to the center support bearing? I know the 135i trans is not the same size as the 128i one so I have to account for that as well. This is all work I can figure out on my own but I'm not trying to reinvent the wheel if I don't have to. Thx |
12-19-2023, 07:55 AM | #2 |
Riffraff
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Drives: 128i 6M, 1UZ S13, '62 C10
Join Date: Apr 2023
Location: Detroit Metro Outskirts
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I would love to see a breakdown of all the driveshaft and differential combinations available on the 1-series. Maybe there's some info out there that I haven't yet come across.
I really want to put a 3.46 diff into my 128 - sort of a middleground between the auto and the stock manual diff. Maybe one out of a Z4 would fit? Do you have the 135i driveshaft? You could always have a reputable driveshaft shop splice them together, but I know the measurements need to be pretty precise since BMW didn't use a slip-yoke anywhere. Good luck dude, would love to see how this turns out. Seems we're on a similar path, building fun cars on the cheap. |
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Blau401.50 |
12-19-2023, 10:21 AM | #3 | |
J
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Drives: BMW 128i
Join Date: Feb 2019
Location: Connecticut
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Quote:
I'm hoping I like the 3.73 since I bought and refreshed one earlier this summer. I am worried I'll hate it on the highway tho. It's not a daily, so we'll just have to see how it goes. Peace. |
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12-19-2023, 12:31 PM | #4 |
Riffraff
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Drives: 128i 6M, 1UZ S13, '62 C10
Join Date: Apr 2023
Location: Detroit Metro Outskirts
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Ahh I bet you'll love the 3.73s. I will probably end up going that route, but with it being my daily I'm resisting the urge to go too racecar. The cool thing is I can just swap the stocker back in if I hate it. I feel like worst-case is that you might have to add a resonator back in to manage the drone if you took one out, but the acceleration will going to be too good to turn back.
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12-19-2023, 01:43 PM | #5 |
J
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Drives: BMW 128i
Join Date: Feb 2019
Location: Connecticut
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cerealwars
This is what I found on realoem. 128i Manual - 1439mm 128i Auto - 1353mm 135i Manual - 1371mm 135i Auto - 1373mm The thing that will help me at this point is figuring out the length of the front section of the driveshaft. I also need to figure out exactly how much longer the 135i manual trans is than the 128i trans. I love maths. |
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12-20-2023, 07:48 AM | #6 |
Riffraff
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Drives: 128i 6M, 1UZ S13, '62 C10
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Do you need measurements for the front half of a stock manual 128i driveshaft? I don't want to promise anything, but I will be underneath my car soon for trans and engine mounts. I might be able to snag some measurements if you need. This also might be a good time to check in with a driveshaft shop, as they might be the ones dictating exactly where they need the measurements taken.
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Blau401.50 |
12-20-2023, 09:13 AM | #7 | |
J
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Drives: BMW 128i
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Location: Connecticut
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Quote:
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01-04-2024, 11:45 AM | #8 |
Second Lieutenant
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FYI I documented the swap in my 135i. I was able to keep the auto driveshaft and the auto 3.46 diff with the manual trans. I know it's not the 3.73, but maybe that helps.
https://www.1addicts.com/forums/show...1810392&page=5
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2009 Widebody 135i ///Build Thread
Instagram: ///TheAxisGarage If you ride like lightning, you're gonna crash like thunder. |
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tracer bullet3453.00 Blau401.50 |
01-04-2024, 03:58 PM | #9 | |
J
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Drives: BMW 128i
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If anyone needs a 135i manual trans... I have one for sale. |
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Dieselboy467.50 |
01-05-2024, 07:21 AM | #10 |
Captain
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www.driveshaftpro.com will make you any driveshaft you want and are incredibly easy to work with. No one will modify an OEM BMW driveshaft because of the way they're welded.
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cerealwars161.00 |
01-09-2024, 12:13 PM | #11 |
Private First Class
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the 135i trans also uses a different input shaft so you would need an n54 clutch as well. You could use a n52 flywheel and pressure plate though.
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Blau401.50 cerealwars161.00 |
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