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prelude2perfect prelude2perfect is offline
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Default Manual 3.08 to Auto 3.46 differential swap - 08-03-2015, 09:53 AM

Did some searching and couldn't find a solid answer. I want to change my final drive from 3.08 to 3.46. I assume swapping the entire differential is the way to do this. What all is needed to swap? I have 03/07 build date manual transmission btw.

Also, can I only find one from a 335i or are there other models that will work like a 328i?


'07 E90 MT Sports Package l FBO l RB Next Gen Plus l JB4 G5 with DPT E85 BEF l N20 MAP Sensor l MMP Inlets l RB Outlets l Custom Exhaust l NLS & 2-Step l MFactory 3.46 LSD l 335is Clutch with MFactory SMFW l Walbro 450 l Direct Port Meth Injection

Best 1/4 ET: 11.4
Best 1.4 Trap: 127.7

Last edited by prelude2perfect; 08-03-2015 at 10:17 AM..
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Default 08-03-2015, 11:06 PM

Really, nobody? Thought this was an easy answer


'07 E90 MT Sports Package l FBO l RB Next Gen Plus l JB4 G5 with DPT E85 BEF l N20 MAP Sensor l MMP Inlets l RB Outlets l Custom Exhaust l NLS & 2-Step l MFactory 3.46 LSD l 335is Clutch with MFactory SMFW l Walbro 450 l Direct Port Meth Injection

Best 1/4 ET: 11.4
Best 1.4 Trap: 127.7
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Default 08-03-2015, 11:41 PM

All you need is a diff with the 3.46 gears.


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Default 08-03-2015, 11:42 PM

I've read about it but never cared since our cars are auto's. IIRC, Terry looked in to doing just the opposite...not sure that he ever did though.



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E90Convert E90Convert is offline
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Default 08-04-2015, 05:46 AM

Find a junk yard automatic 335i and pull the rear end. Should be the same axle


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Default 08-04-2015, 05:58 AM

Only 335i's work or are there other E90's that work?


'07 E90 MT Sports Package l FBO l RB Next Gen Plus l JB4 G5 with DPT E85 BEF l N20 MAP Sensor l MMP Inlets l RB Outlets l Custom Exhaust l NLS & 2-Step l MFactory 3.46 LSD l 335is Clutch with MFactory SMFW l Walbro 450 l Direct Port Meth Injection

Best 1/4 ET: 11.4
Best 1.4 Trap: 127.7
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Default 08-04-2015, 06:08 AM

im not sure about different engines,

but i left 3.46 diff in my car after swaping to manual

do you have any specific question?


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jyamona jyamona is offline
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Default 08-04-2015, 07:48 AM

I swapped the 3.46 into my 6MT. It is fine, just make sure you get a "large pumpkin" 3.46, as all 6MT use the large pumpkin.

Also, you will want to change the values for the "Gear Ratio Calculation" table in the DME. This table will be published to the public XDF's soon. I have the correct values now. With the stock values, it would report your gear incorrectly...which did not play nice w/ my upcoming load by gear


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Default 08-04-2015, 08:08 AM

Quote:
Originally Posted by jyamona
I swapped the 3.46 into my 6MT. It is fine, just make sure you get a "large pumpkin" 3.46, as all 6MT use the large pumpkin.

Also, you will want to change the values for the "Gear Ratio Calculation" table in the DME. This table will be published to the public XDF's soon. I have the correct values now. With the stock values, it would report your gear incorrectly...which did not play nice w/ my upcoming load by gear
WOW!!!! it sounds so interesting!!!!!

maybe finaly i find reason of my pt-can errors


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Default 08-04-2015, 09:54 AM

Quote:
Originally Posted by jyamona
I swapped the 3.46 into my 6MT. It is fine, just make sure you get a "large pumpkin" 3.46, as all 6MT use the large pumpkin.

Also, you will want to change the values for the "Gear Ratio Calculation" table in the DME. This table will be published to the public XDF's soon. I have the correct values now. With the stock values, it would report your gear incorrectly...which did not play nice w/ my upcoming load by gear
Thank you very much jyamona, that's the info I needed to know. I didn't know it had to remain a large pumpkin for the swap to work.


'07 E90 MT Sports Package l FBO l RB Next Gen Plus l JB4 G5 with DPT E85 BEF l N20 MAP Sensor l MMP Inlets l RB Outlets l Custom Exhaust l NLS & 2-Step l MFactory 3.46 LSD l 335is Clutch with MFactory SMFW l Walbro 450 l Direct Port Meth Injection

Best 1/4 ET: 11.4
Best 1.4 Trap: 127.7
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Default 08-04-2015, 10:09 AM

Anyone know what the E60 535i's 6mt come with?


'07 E90 MT Sports Package l FBO l RB Next Gen Plus l JB4 G5 with DPT E85 BEF l N20 MAP Sensor l MMP Inlets l RB Outlets l Custom Exhaust l NLS & 2-Step l MFactory 3.46 LSD l 335is Clutch with MFactory SMFW l Walbro 450 l Direct Port Meth Injection

Best 1/4 ET: 11.4
Best 1.4 Trap: 127.7
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Default 12-19-2015, 10:20 AM

Quote:
Originally Posted by prelude2perfect
Anyone know what the E60 535i's 6mt come with?
I have been researching for my 6AT-6MT swap and dug this thread up while looking into the FD Ratios. Here is info from a 2008 E60 brochure which will answer your question.

For the record the E60 M5 is 3.62 because it doesn't have any cohones.

Personally I have the 3.46 in my xi wagon, which is fine but have been spending some time behind my buddies single turbo E90 with 3.08 and am a huge fan. It gets me thinking what the 2.93 would be like on a heavily modified N54, I have not heard of anyone running this.

Evan



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Default 12-19-2015, 10:26 AM

What is the benifit of doing this? Mfactory is doing mine in a few days. I can change it before its too late if this is a good idea..
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Default 12-19-2015, 11:47 AM

Quote:
Originally Posted by idratherbesurfing
What is the benifit of doing this? Mfactory is doing mine in a few days. I can change it before its too late if this is a good idea..
Final Drive will change the ratio of engine input to wheel output. For example if you were running a taller 3.08 and went up to a shorter 3.46 your engine will be at higher rpms in the same gear.

This is my understanding... Shorter gearing can make seem faster as the engine has an easier time getting the power to the rear wheels, therefore appearing to be more powerful but it doesn't necessarily translate to the car actually being faster as a shorter gearing can make the tires break traction earlier than they otherwise would and shorter gearing will also mean you have to upshift sooner.

Just think about launching your car in 1st gear vs 2nd gear, 1st is shorter than 2nd, same concept applies to the Final Drive ratio in the Diff except it applies to all the gears you will shift through. Also, a taller FD ratio will allow the car to cruise on the highway at lower rpms and have a higher top speed.

You should consider the balance of engine power and type of power (hp vs tq) with your transmission gearing, and the cars intended use. If these are completely out of wack the car would drive in an unfavorable way. For example an E60 M5 (high hp, low tq) with a 2.93 would have a hard time getting off the time and a tuned N54 (gobs of tq) with a 3.64 would light the tires up all over the place. Assuming you are within in normal range it comes down to intended use and personal preference.

Evan


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Default 12-20-2015, 12:29 PM

Quote:
Originally Posted by ucsbwsr
Final Drive will change the ratio of engine input to wheel output. For example if you were running a taller 3.08 and went up to a shorter 3.46 your engine will be at higher rpms in the same gear.

This is my understanding... Shorter gearing can make seem faster as the engine has an easier time getting the power to the rear wheels, therefore appearing to be more powerful but it doesn't necessarily translate to the car actually being faster as a shorter gearing can make the tires break traction earlier than they otherwise would and shorter gearing will also mean you have to upshift sooner.

Just think about launching your car in 1st gear vs 2nd gear, 1st is shorter than 2nd, same concept applies to the Final Drive ratio in the Diff except it applies to all the gears you will shift through. Also, a taller FD ratio will allow the car to cruise on the highway at lower rpms and have a higher top speed.

You should consider the balance of engine power and type of power (hp vs tq) with your transmission gearing, and the cars intended use. If these are completely out of wack the car would drive in an unfavorable way. For example an E60 M5 (high hp, low tq) with a 2.93 would have a hard time getting off the time and a tuned N54 (gobs of tq) with a 3.64 would light the tires up all over the place. Assuming you are within in normal range it comes down to intended use and personal preference.

Evan

wow ok well put...i will keep my diff 3.08 the same until i see furthers experiences with this!
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Default 12-20-2015, 04:26 PM

Throwing my opinion in here as well. Definitely stick with the 3.08. I have a 3.46 with a MFactory LSD in my car right now and will be switching to a 3.08 with MFactory LSD. Cruising at 80mph keeps me around 3200 rpm (pretty annoying for longer trips). Also at over 600whp the shorter gearing just causes A LOT more spinning even with good tires.


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Default 12-20-2015, 06:12 PM

Quote:
Originally Posted by Dmac @ BMS/DMD
Throwing my opinion in here as well. Definitely stick with the 3.08. I have a 3.46 with a MFactory LSD in my car right now and will be switching to a 3.08 with MFactory LSD. Cruising at 80mph keeps me around 3200 rpm (pretty annoying for longer trips). Also at over 600whp the shorter gearing just causes A LOT more spinning even with good tires.
^^ this

also had 3.46 LSD, MT, ST,
was definitely planning to change to 3.08


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JB4 G5, ST Pump Flash, Fuel-It Stage 1, Meth
MT (after swap),
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Default 12-21-2015, 12:14 PM

Turbo engines love load so i would stick with the 3.08


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Default 02-04-2016, 04:01 AM

Depends what you are using the car for. I track (road course) and the 3.46 fits me better. I have more torque to the wheels faster with this setup and easier to modulate boost buildup out of corners with higher engine speed. Sure there will be some more shifting but that is part of racing.

Straight line racing will not benefit from the switch for sure. Get longer and maybe fewer gears in a AT for that stuff.
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Default 02-04-2016, 04:02 AM

Quote:
Originally Posted by jyamona
I swapped the 3.46 into my 6MT. It is fine, just make sure you get a "large pumpkin" 3.46, as all 6MT use the large pumpkin.

Also, you will want to change the values for the "Gear Ratio Calculation" table in the DME. This table will be published to the public XDF's soon. I have the correct values now. With the stock values, it would report your gear incorrectly...which did not play nice w/ my upcoming load by gear
What are the correct values after the swap? Might have missed you posting them..
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Default 02-07-2016, 05:22 AM

Quote:
Originally Posted by ucsbwsr
I have been researching for my 6AT-6MT swap and dug this thread up while looking into the FD Ratios. Here is info from a 2008 E60 brochure which will answer your question.

For the record the E60 M5 is 3.62 because it doesn't have any cohones.

Personally I have the 3.46 in my xi wagon, which is fine but have been spending some time behind my buddies single turbo E90 with 3.08 and am a huge fan. It gets me thinking what the 2.93 would be like on a heavily modified N54, I have not heard of anyone running this.

Evan


Since you have an E60/E61 platform like I do and researched this do you know if an early build 335i large diff would bolt up to my 535i? I see the output flange size is the same ( I have a large diff) but curious about the driveshaft input. I'm thinking they would work if the large diff/pumpkins are the same overall dimensions.

I mainly want to do this for several reasons:

1. Going from 3.46 to 3.08 for more load and less shifting for 1/4 mile
2. Large bolted diff so no machining ring gear required
3. LSD life

Thanks
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MFactory MFactory is offline
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Default 02-07-2016, 10:56 AM

535i AT is the small bolted diff.


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Default 05-23-2017, 03:24 PM

I know this thread is a little old, but not too bad...so I'm bringing it back to life, hopefully!

Bought a 3.46 AUTO diff from an '05 530i to swap INTO my Son's '05 530i MANUAL car (2.93 gears). The car has the M54 231HP motor w/6-sped manual tranny. I think the 3.46 will make that car really fun to drive!

This is the diff. Is this a large pumpkin? Will this fit/work without mods??
(I have more pics if needed)

Please, any help is greatly appreciated. We wanted to do this on this upcoming Saturday (May 27th 2017).

Thank you!

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2010 535i M-Sport w/Sport AT, Alpine White w/Natural Leather, type-135 wheels w/spacers & Coilovers --- JB4 G5 ISO Trebila (Map-6) Custom Tune, Custom Meth Setup, VRSF 3" free-flow D/Ps, MMPe DCIs, Wagner 1060 Stepped FMIC, VRSF Chargepipe/Tial BOV, BMS Oil Cooler Valve
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defineste90 defineste90 is offline
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Default 05-25-2017, 06:09 AM

yes its all the same diff i had VAC build my LSD with 3.46 gears for my manual car no issues bolts right in its just a different ring gear
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ShocknAwe ShocknAwe is offline
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Default 05-25-2017, 06:21 AM

Has anyone swapped the DCT or 335d gearing into a 6MT rear end? Wonder what that would be like with slightly longer gearing compared to the 3.08


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