BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)
 





 

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      02-16-2018, 09:08 AM   #23
bionicbelly
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Quote:
Originally Posted by Z3SpdDmn View Post
I'm not. I HEARD that it had the giant nut. It sounds like that's the case on the 135i, but not the 128i. Great news! Should be a cinch.



Can anyone confirm if the subframe needs to come all the way out to change out the diff bushings? This is what I'm trying to avoid.

Thanks!
Hey, I put some pictures of the tool I used and pictures of it in place if you want to see. I do not know about other methods, but this tool could be used with the SF in the car.

http://www.1addicts.com/forums/showt...1#post22792501
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      02-16-2018, 12:06 PM   #24
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Went ahead and ordered the Team MFactory 3.46 LSD for 135i a/t

Going to swap the flanges and rear cover and it should be right at home!
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      02-16-2018, 05:24 PM   #25
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Very interested in how this goes. I wanted to do an auto diff, so I could get that better ratio, but everyone I talked to said they didn't think it would work ,but didn't know for sure. PLEASE post info and results
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      02-18-2018, 08:33 PM   #26
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Quote:
Originally Posted by bionicbelly View Post
Very interested in how this goes. I wanted to do an auto diff, so I could get that better ratio, but everyone I talked to said they didn't think it would work ,but didn't know for sure. PLEASE post info and results
I will post a separate thread so keep an eye out, I will also try to remember to put a link to it in this thread.

Very excited, should be here next week
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      02-20-2018, 06:06 AM   #27
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Quote:
Originally Posted by E30ROB View Post
Went ahead and ordered the Team MFactory 3.46 LSD for 135i a/t

Going to swap the flanges and rear cover and it should be right at home!
Was forum surfing, this made me login at two a.m. Precisely the exact mod is on this spring 18 bucketlist.

.64 or .73 not for me. Exactly This has been my plan for 18 months. You have an obligation here you know !

Found some donors here in PDX. Who / or where did you execute this?
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      02-25-2018, 07:41 PM   #28
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bionicbelly , I'm bying that Z3 3.0i Coupe. Working out transport logistics to ship it from CA to MI
http://www.z3coupebuyersguide.com/li...istingID=12279
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      02-26-2018, 08:44 AM   #29
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Originally Posted by Z3SpdDmn View Post
bionicbelly , I'm bying that Z3 3.0i Coupe. Working out transport logistics to ship it from CA to MI
http://www.z3coupebuyersguide.com/li...istingID=12279
Oh hell yeah. That was a great deal, and gorgeous car. I am SO excited for this! Congrats!
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      03-04-2018, 08:09 PM   #30
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Update on the differential situation..

So after a lot of thinking and frustration, the 128i flange WILL NOT fit onto the 135i differential.

I just ordered a 128i rear driveshaft half, and a 135i rear driveshaft half, I will have the 128i flange cut off and the 135i flange welded on and balanced to the 128i driveshaft and I should be good to go, everything else will work just fine (rear cover, mounting points, and axle flanges)
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      03-04-2018, 09:21 PM   #31
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Quote:
Originally Posted by E30ROB View Post
Update on the differential situation..

So after a lot of thinking and frustration, the 128i flange WILL NOT fit onto the 135i differential.

I just ordered a 128i rear driveshaft half, and a 135i rear driveshaft half, I will have the 128i flange cut off and the 135i flange welded on and balanced to the 128i driveshaft and I should be good to go, everything else will work just fine (rear cover, mounting points, and axle flanges)
IMHO
That seems like a lot of wasted effort for a 128. You will no longer have an OEM driveshaft and then you will have a bitch of a time getting the driveshaft off if need be. There are tons of 328 diffs out there to purchase to prep for a lsd with 3.64. Have you verified the outside diameter of both driveshafts?

I’m just waiting to get the extra cash to put mine in. For the time being the 3.73 is in.
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      03-05-2018, 08:28 AM   #32
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Quote:
Originally Posted by E30ROB View Post
Update on the differential situation..

So after a lot of thinking and frustration, the 128i flange WILL NOT fit onto the 135i differential.

I just ordered a 128i rear driveshaft half, and a 135i rear driveshaft half, I will have the 128i flange cut off and the 135i flange welded on and balanced to the 128i driveshaft and I should be good to go, everything else will work just fine (rear cover, mounting points, and axle flanges)
Dang, that is a rough lesson. I do not envy you. But, it is great info, and will help everyone interested in this job. Thanks for sharing.

One thing to think about, The front flange should be the same, it MAY be easier to do the whole 135 driveshaft, and just shorten it if applicable. It would worry me to have separately balance DS halves. (I have zero actual experience with this though.)
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      03-05-2018, 01:25 PM   #33
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Quote:
Originally Posted by bionicbelly View Post
Dang, that is a rough lesson. I do not envy you. But, it is great info, and will help everyone interested in this job. Thanks for sharing.

One thing to think about, The front flange should be the same, it MAY be easier to do the whole 135 driveshaft, and just shorten it if applicable. It would worry me to have separately balance DS halves. (I have zero actual experience with this though.)
Unfortunately a 128 front does not match to a 135 in the splines. They are 1.5mm larger on the 135 side. and you will not be able to tell till you have trashed both ends. i made that mistake when I did my swapon my 328/335 n55 wagon.
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      03-05-2018, 01:59 PM   #34
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Originally Posted by gixracer View Post
Unfortunately a 128 front does not match to a 135 in the splines. They are 1.5mm larger on the 135 side. and you will not be able to tell till you have trashed both ends. i made that mistake when I did my swapon my 328/335 n55 wagon.
I actually meant to use the entire 135 driveshaft, and lengthen or shorten it. (again, may or may not be possible) The flange that bolts to the guibo should be the same, center bearing should be in the same spot. If the 135 driveshaft is a larger diameter, it would make transplanting the the diff end flange difficult. Again, talking with no experience.
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      03-06-2018, 10:26 AM   #35
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Quote:
Originally Posted by bionicbelly View Post
I actually meant to use the entire 135 driveshaft, and lengthen or shorten it. (again, may or may not be possible) The flange that bolts to the guibo should be the same, center bearing should be in the same spot. If the 135 driveshaft is a larger diameter, it would make transplanting the the diff end flange difficult. Again, talking with no experience.
The 135 rear section will be fine. Your issue is the diffence in trans length. The whole 135 driveshaft would be the best option because you can match the diameters of the front when you have to adjust. There is about 4 inches of spline connecting the halves. A 5-10mm stretch would be negligible in the grand scheme of things.
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      03-06-2018, 10:39 AM   #36
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You guys going through all of this trouble to fit a 3.46 rear end is kind of ridiculous. You will not even notice a difference, hardly. You'll be kicking yourself the second you drive it, wondering why you spent so much time and money on such a low-yield mod.

Just get the 3.73 and be done with it. The rear ends are readily available and bolt right up. Cruise down the highway in 5th gear for an approximation of your new top end - I bet most folks would find it very livable.
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      03-06-2018, 11:13 PM   #37
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2012 BMW 128i  [5.00]
I might have missed it, but why deal with the headache of a 135i rear end when there are tons of 128i/328i rear ends out there that will bolt up perfectly? And they can be had for $150-$200.
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      03-07-2018, 12:59 AM   #38
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I just fit the 3.64 3-clutch Diffsonline diff this weekend from BimmerWorld. I LOVE IT!!!!! It brings the gearing right to where it should be and, paired with the 3SI (and BMW PI and PE and BMS PBX), it makes it a joy to rev out now!

I also put Powerflex black series bushings in the diff mounts, which took some slop out of the drivetrain, reducing some minor chatter I had at clutch take-up. Barely perceptble NVH increase (spoken from someone who's trained to pick up on it), which would likely not be noticed by most people.
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      03-07-2018, 10:44 AM   #39
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Quote:
Originally Posted by Bimmer-Bob View Post
You guys going through all of this trouble to fit a 3.46 rear end is kind of ridiculous. You will not even notice a difference, hardly. You'll be kicking yourself the second you drive it, wondering why you spent so much time and money on such a low-yield mod.

Just get the 3.73 and be done with it. The rear ends are readily available and bolt right up. Cruise down the highway in 5th gear for an approximation of your new top end - I bet most folks would find it very livable.
agreed, I had a chance to drive mine before it snowed again and the 3.73 is growing on me. just need the lsd. But agreeing with other comments above ^^^^the idea of having to fabricate items versus off the shelf is a pain in the ass and they tend not to make sense(cents/cost) sometimes
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      03-18-2018, 09:45 PM   #40
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Back on track, a driveshaft has been ordered for a hell of a good deal.

In the end all I should need is the driveshaft, half shafts will bolt up and the diff will sit in original mounting points on subframe.

Once the driveshaft shows up I will take measurements and see if i can just swap out the rear section of the current driveshaft in the car. If not, I will have the 128i driveshaft flange cut off and the 135i flange welded.

Any recommendations on driveshaft shops with fast turn around times?
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      03-18-2018, 09:51 PM   #41
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And to answer the question of why the large case 135i diff into a 128i, that was not the original plan.

The only gamble I knowingly took was the difference in driveshaft flanges, I wasn't expecting to receive a 215mm differential, but I will explain that below..

When I ordered the diff for a 135i a/t I was under the impression ALL automatic 135i's came with a 188mm differential. Sadly that wasn't the case, and ECS sent me a 215mm differential.

After receiving it and finding out it was a 215mm i would have had to spend $300 on shipping at the end of the day after getting the correct 188mm size diff so I decided to find out if it might work.

My research proved it will fit into the chassis and the only issue was the driveshaft flange.
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      03-19-2018, 09:33 AM   #42
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Quote:
Originally Posted by E30ROB View Post
And to answer the question of why the large case 135i diff into a 128i, that was not the original plan.

The only gamble I knowingly took was the difference in driveshaft flanges, I wasn't expecting to receive a 215mm differential, but I will explain that below..

When I ordered the diff for a 135i a/t I was under the impression ALL automatic 135i's came with a 188mm differential. Sadly that wasn't the case, and ECS sent me a 215mm differential.

After receiving it and finding out it was a 215mm i would have had to spend $300 on shipping at the end of the day after getting the correct 188mm size diff so I decided to find out if it might work.

My research proved it will fit into the chassis and the only issue was the driveshaft flange.
So now you are really screwed...... there are no large pumpkin halfshafts with small spines axles. 128s have small splines at the hubs. Your axles are longer for the small diff.
Good luck ��

I went through this when I did the full 135 rear swap on mine to retain the ebrake. I have 135 hubs and brakes. The rear axles are 335 auto axles mating to 128 rear diff. The 128 axles are worthless and offered on 325 cars also. The small spline outboard are for the lower hp cars to reduce weight to match the small diff.

If you need I have set of lci 3 series hubs with ebrakes/rotors/calipers available, but then you would need short(manual 335 axles)

Last edited by gixracer; 03-19-2018 at 11:43 AM.
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      04-02-2018, 02:28 PM   #43
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Question

UP please

I am really interresting about this topic.

Details ofmy project : i have installed 135i front brakes on my 125i 6MT and now i want to install the 135i whole rear axle (for rear brakes benefits).



E30ROB can you please tell us if the rear 135i propeller shaft match with the 128i front??? Do the splines shaft between 125/128 & 135i are the same?




It seems that my 3,23 (188) diff doesn't match with 135i 1/2 axles(lengths are a little differents) I measured the diffs width (between the output flanges) and my 3,23 diff (small case 188 type) is shorter than the big case 215 type

One solution is to find a diff (~3,46 ratio) that match with 135i rear axles and with my 125i propeller shaft (4 screws). Do this diff exist?


gixracer If i have correctly understand you, an other solution (and maybe better) for succeed this swap is to use "335 auto axles mating to 128 rear diff" Correct? Do you have the P/N please?

Thank you for your help & clarifications and sorry for my poor English

All suggestions are welcome

Best regards

Last edited by ornicar; 04-02-2018 at 02:35 PM.
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      04-03-2018, 07:49 AM   #44
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Quote:
Originally Posted by ornicar View Post
UP please

I am really interresting about this topic.

Details ofmy project : i have installed 135i front brakes on my 125i 6MT and now i want to install the 135i whole rear axle (for rear brakes benefits).



E30ROB can you please tell us if the rear 135i propeller shaft match with the 128i front??? Do the splines shaft between 125/128 & 135i are the same?




It seems that my 3,23 (188) diff doesn't match with 135i 1/2 axles(lengths are a little differents) I measured the diffs width (between the output flanges) and my 3,23 diff (small case 188 type) is shorter than the big case 215 type

One solution is to find a diff (~3,46 ratio) that match with 135i rear axles and with my 125i propeller shaft (4 screws). Do this diff exist?


gixracer If i have correctly understand you, an other solution (and maybe better) for succeed this swap is to use "335 auto axles mating to 128 rear diff" Correct? Do you have the P/N please?

Thank you for your help & clarifications and sorry for my poor English

All suggestions are welcome

Best regards
The splines don’t match between 135 rear and 128 front. Been there tried that.
Any of the 335 hubs will work, hubs are 10mm inboard and allow better square offsets.
You can then use large stub axles Fromuth 328 or an auto 335.
Use this link for help on diff size
http://http://www.vacmotorsports.com/news/335i-and-135i-differential-faq-no-lsd-really-1483338466.html
Make sure you have the matching axles for the diff size. Just because they”fit”doesn’t mean they work. Part #’s are all over the board, check on realoem.com and see what you have access to.
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