Which Final Drive is in the 2017 M240i

Dom147 · 11-02-2023, 08:08 AM

I've been having trouble determining what final drive ratio is in 03/2017 automatic M240i. I thought that it might be 2.81 since on realoem that is what is stated to be the final drive ratio for the m performance lsd for the auto, however, on BMW it says that this is incompatible with the 2017 m240i and that the only one compatible with my car is the 3.08 one which I thought was only for the manual. Can anyone share some insight on early M240i production models or any insight in general?

Dom147 · 11-02-2023, 12:44 PM

to add more confusion onto this, diffsonline considers 3.08 to be the stock final drive ratio for the automatic M240i, and you have to pay an extra $1,000 for the 2.81.

SpencerC_6MT · 11-02-2023, 09:44 PM

My understanding is that all M235i's got the 3.08, but auto M240i's dropped to 2.81 while manuals stuck with 3.08. From what I understand, this is because of the changeover from 8HP45 to 8HP50, which has slightly different gear ratios. I'd be surprised if they changed the F/D part-way through production, so your best bet is 2.81.

Dom147 · 11-09-2023, 09:05 AM

I just noticed that on diffsonline, for the m240i automatic option, it is listed as being for only the LCI M240i. Interesting...

JMcLellan · 11-09-2023, 10:22 AM

I still have the stock diff from my 2019 M240i auto transmission car. The sticker says 2.81 on it.

dradernh · 11-09-2023, 07:09 PM

Quote:

Originally Posted by Dom147

to add more confusion onto this, diffsonline considers 3.08 to be the stock final drive ratio for the automatic M240i

I recommend calling Dan Fitzgerald at Diffsonline.com to find out exactly what the story is. He'll pick up, and the conversation will be short.

Dom147 · 11-10-2023, 09:48 AM

Quote:

Originally Posted by dradernh

I recommend calling Dan Fitzgerald at Diffsonline.com to find out exactly what the story is. He'll pick up, and the conversation will be short.

Got my response! He told me that he's seen a mix of both come through!

DaviTuned · 11-10-2023, 11:55 AM

If this helps anyone here is more information:

https://f30.bimmerpost.com/forums/sh....php?t=1722319

This post tells you more information about our cars.

11-02-2023, 08:08 AM	#1
Dom147 Second Lieutenant 91 Rep 249 Posts Drives: 2014 BMW 228i, 2017 BMW M240i Join Date: Apr 2021 Location: Northern Virginia iTrader: (1) Garage List 2017 BMW M240i [0.00]	Which Final Drive is in the 2017 M240i I've been having trouble determining what final drive ratio is in 03/2017 automatic M240i. I thought that it might be 2.81 since on realoem that is what is stated to be the final drive ratio for the m performance lsd for the auto, however, on BMW it says that this is incompatible with the 2017 m240i and that the only one compatible with my car is the 3.08 one which I thought was only for the manual. Can anyone share some insight on early M240i production models or any insight in general?
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11-02-2023, 12:44 PM	#2
Dom147 Second Lieutenant 91 Rep 249 Posts Drives: 2014 BMW 228i, 2017 BMW M240i Join Date: Apr 2021 Location: Northern Virginia iTrader: (1) Garage List 2017 BMW M240i [0.00]	to add more confusion onto this, diffsonline considers 3.08 to be the stock final drive ratio for the automatic M240i, and you have to pay an extra $1,000 for the 2.81.
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11-02-2023, 09:44 PM	#3
SpencerC_6MT Second Lieutenant 197 Rep 239 Posts Drives: '17 M240i 6MT Join Date: May 2017 Location: San Diego, CA /// Tuscaloosa, AL iTrader: (0) Garage List 2017 BMW M240I [0.00]	My understanding is that all M235i's got the 3.08, but auto M240i's dropped to 2.81 while manuals stuck with 3.08. From what I understand, this is because of the changeover from 8HP45 to 8HP50, which has slightly different gear ratios. I'd be surprised if they changed the F/D part-way through production, so your best bet is 2.81. __________________ 2017 BMW M240i 6MT Slicktop \| Wavetrac 3.46:1 Limited-Slip Diff - DinanTRONICS Sport Boost Controller - H&R Sport Springs - Millway Street Camber Plates - Agency Power Intake w/ Paradigm Engineering Turbo Inlet
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11-09-2023, 09:05 AM	#4
Dom147 Second Lieutenant 91 Rep 249 Posts Drives: 2014 BMW 228i, 2017 BMW M240i Join Date: Apr 2021 Location: Northern Virginia iTrader: (1) Garage List 2017 BMW M240i [0.00]	I just noticed that on diffsonline, for the m240i automatic option, it is listed as being for only the LCI M240i. Interesting...
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11-09-2023, 10:22 AM	#5
JMcLellan Major 2065 Rep 1,198 Posts Drives: 2024 M2 Join Date: Mar 2022 Location: MN iTrader: (0)	I still have the stock diff from my 2019 M240i auto transmission car. The sticker says 2.81 on it. __________________ 2024 M2 2019 M240i- Sold
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11-10-2023, 11:55 AM	#8
DaviTuned Enlisted Member 16 Rep 32 Posts Drives: 2017 M240xi Join Date: Jul 2023 Location: Philadelphia, PA iTrader: (0)	If this helps anyone here is more information: https://f30.bimmerpost.com/forums/sh....php?t=1722319 This post tells you more information about our cars.
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