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Thread: 840 driveshaft

  1. #1
    Join Date
    Jun 2012
    Location
    Mundelein, IL
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    837
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    840Ci/6 528iT Europa TCS

    840 driveshaft

    Hi folks. As you can tell from my avatar I have three pedals. The 6 speed swap has been completed for two or three years. Every part was new or used original BMW except the drive shaft. I had mine cut and balanced. I have since (as of yesterday) replaced my cut and balanced drive shaft with a new OEM shaft and it fit perfectly. This also validates, at least in my mind, that the swap was done correctly. The only difference that I can figure between my swap and an OEM built six speed is the fact that I do not need to depress the clutch to start the car. I think I could have installed that switch as well, but going back to every other stick shift car I have owned there never was a need to depress the clutch in order to start the car. So why start now?
    If anyone is thinking of performing the six speed swap I have your drive shaft in the box and ready to ship.

  2. #2
    Join Date
    Apr 2011
    Location
    The OC, CA
    Posts
    696
    My Cars
    95 840Ci
    Did you notice any difference between yours and the OEM shaft? How much? Ship to OC?
    Current
    95 e31 840 Ci (Auto) Orient Blue 61k
    11 e90 328i Space Gray
    18 F15 X5 35i XDrive White

    Past
    00 e38 740 i (Auto) Titanium Silver
    94 e31 840 Ci (6 speed conv.) Avus Blau (This car was Awesome!)
    03 e46 325 Ci (Auto) Jet Black
    91 e31 850i (Auto) Diamond Black, Yes, two!
    91 e31 850i (Auto) Diamond Black
    00 e39 528i (Auto) Jet Black
    92 e36 325i (Auto) Laguna Green


  3. #3
    Join Date
    Jan 2011
    Location
    Oro Valley, AZ - USA
    Posts
    1,706
    My Cars
    see my signature
    Shipping to Tucson might be closer! Plus Rick's driveshaft was cut to fit a green 840ci, not a blue one! Lol

    Hey just kidding Mark, since we're all current or former 840 6 speed owners here

    Where did you get your driveshaft Rick? Schmiedmann? That's where I was planning to get one from. But not so sure I can stomach the thought of conversion anymore, with 5 other BMWs to feed, there's just too many other projects!

  4. #4
    Join Date
    Apr 2011
    Location
    The OC, CA
    Posts
    696
    My Cars
    95 840Ci
    Joe, your zoo doesn't seem to be getting any smaller. But I think 6 speeds were born to be blue!
    Current
    95 e31 840 Ci (Auto) Orient Blue 61k
    11 e90 328i Space Gray
    18 F15 X5 35i XDrive White

    Past
    00 e38 740 i (Auto) Titanium Silver
    94 e31 840 Ci (6 speed conv.) Avus Blau (This car was Awesome!)
    03 e46 325 Ci (Auto) Jet Black
    91 e31 850i (Auto) Diamond Black, Yes, two!
    91 e31 850i (Auto) Diamond Black
    00 e39 528i (Auto) Jet Black
    92 e36 325i (Auto) Laguna Green


  5. #5
    Join Date
    Jan 2011
    Location
    Oro Valley, AZ - USA
    Posts
    1,706
    My Cars
    see my signature
    Haha, Rick might disagree with you there! And yes the zoo is being over'run by greenies!

    BTW the part number is 26101227880, looking for the 1418mm driveshaft. It is unique to the 840i (not Ci, although we don't make that distinction here in the USA market). RealOEM says it was used on some autos too, but not sure what transmissiond those 840s would have.
    Last edited by Chamberlin; 04-19-2019 at 10:44 PM.

  6. #6
    Join Date
    Nov 2018
    Location
    Sweden
    Posts
    60
    My Cars
    1994 840ci
    Quote Originally Posted by rjbaren View Post
    Hi folks. As you can tell from my avatar I have three pedals. The 6 speed swap has been completed for two or three years. Every part was new or used original BMW except the drive shaft. I had mine cut and balanced. I have since (as of yesterday) replaced my cut and balanced drive shaft with a new OEM shaft and it fit perfectly. This also validates, at least in my mind, that the swap was done correctly. The only difference that I can figure between my swap and an OEM built six speed is the fact that I do not need to depress the clutch to start the car. I think I could have installed that switch as well, but going back to every other stick shift car I have owned there never was a need to depress the clutch in order to start the car. So why start now?
    If anyone is thinking of performing the six speed swap I have your drive shaft in the box and ready to ship.
    I have a eurospec manual 840 -94 ,and I don't need to press the clutchpedal to start the car.

  7. #7
    Join Date
    Jun 2012
    Location
    Mundelein, IL
    Posts
    837
    My Cars
    840Ci/6 528iT Europa TCS
    Well Mr. Davidof, thank you for that bit of information. I guess my 840 is up to date then.

  8. #8
    Join Date
    Jun 2020
    Location
    Bay Area
    Posts
    314
    My Cars
    1994 E31 840ci 2000 Z3 M
    Quote Originally Posted by rjbaren View Post
    Hi folks. As you can tell from my avatar I have three pedals. The 6 speed swap has been completed for two or three years. Every part was new or used original BMW except the drive shaft. I had mine cut and balanced. I have since (as of yesterday) replaced my cut and balanced drive shaft with a new OEM shaft and it fit perfectly. This also validates, at least in my mind, that the swap was done correctly. The only difference that I can figure between my swap and an OEM built six speed is the fact that I do not need to depress the clutch to start the car. I think I could have installed that switch as well, but going back to every other stick shift car I have owned there never was a need to depress the clutch in order to start the car. So why start now?
    If anyone is thinking of performing the six speed swap I have your drive shaft in the box and ready to ship.
    Are you still selling your drive shaft? Im currently in the middle of my swap and I the shop nearby me said they dont think they can lengthen my because the u-joint is bad. I could order another automatic driveshaft but at that point I could order a manual (I think) from germany.

    A question for someone who might know the answer to this: should a reputable shop be able to lengthnen these deiveshafts and replace the u-joint with a servicable u-joint?

    Sent from my SM-G970U using Tapatalk

  9. #9
    Join Date
    Oct 2016
    Location
    Shoreview MN
    Posts
    977
    My Cars
    Had a 1991 BMW 850

    U Joint Replacement

    These are your options on the U-Joint.

    https://www.bimmerforums.com/forum/s...nt-Replacement

    Any shop can make them shorter or longer. Just need the right size shaft after that is is cut and weld

  10. #10
    Join Date
    Jun 2020
    Location
    Bay Area
    Posts
    314
    My Cars
    1994 E31 840ci 2000 Z3 M
    Thanks rjjablo, I'll look into it.

    Sent from my SM-G970U using Tapatalk

  11. #11
    Join Date
    Sep 2008
    Location
    Santa Barbara
    Posts
    3,462
    My Cars
    91 Dinan860 & 91 850 6sp
    www.driveshaftpro.com

    buy a new one...
    you will have to tell them exactly what you need though, as manual 840's did not ship over here
    '91 Dinan 860 Stage III (new 6L engine)
    '91 Dinan 850 TT stage III (brand new engine) 21st Century Tech meets 18th Century Dinan...
    '91 850i 6sp (mint) (sold)
    '90 Dinan 750iL TT stage III (Guido - The Beast)
    '94 850 CSi The Detroit Auto Show car (restored to factory perfect) (sold)
    '96 850Ci, The George Carlin car
    ''73 3.0 csi, '08 535i, '03 X5 4.6is
    ...and a few other non BMW cars

  12. #12
    Join Date
    Jun 2020
    Location
    Bay Area
    Posts
    314
    My Cars
    1994 E31 840ci 2000 Z3 M
    Quote Originally Posted by cartoonz View Post
    www.driveshaftpro.com

    buy a new one...
    you will have to tell them exactly what you need though, as manual 840's did not ship over here
    Hey cartoonz, do you have any recommendations for places in the bay area? Right now I'm working with South Bay driveline.

    Sent from my SM-G970U using Tapatalk

  13. #13
    Join Date
    Jun 2020
    Location
    Bay Area
    Posts
    314
    My Cars
    1994 E31 840ci 2000 Z3 M
    Spoke to the owner of the driveshaft shop, he's been doing this for 35 years so I have confidence in his work. Now he said that I can find a driveshaft to use as a donor from a 7 series, but since the drivetrain is shared with a 5 series as well, can I use either? And would it matter if its a e34/e39 540 or a e32/e38 740 or 750?

  14. #14
    Join Date
    Sep 2008
    Location
    Santa Barbara
    Posts
    3,462
    My Cars
    91 Dinan860 & 91 850 6sp
    DiveshaftPro is part of a Nationwide operation... ask them if there is a Bay Area affilliate, or just let them ship it - they ship Nationwide too.
    Reason i suggest them is that:
    A: A Brand New driveshaft from them is only about ~$600+/- > a "rebuild/modify" will be more.
    B: The new ones from them have SERVICEABLE U-Joints (Spicer), factory does not.
    C: Betcha they get it to you faster

    I've bought 1/2 dozen driveshafts from these guys and they have always been amazing.
    '91 Dinan 860 Stage III (new 6L engine)
    '91 Dinan 850 TT stage III (brand new engine) 21st Century Tech meets 18th Century Dinan...
    '91 850i 6sp (mint) (sold)
    '90 Dinan 750iL TT stage III (Guido - The Beast)
    '94 850 CSi The Detroit Auto Show car (restored to factory perfect) (sold)
    '96 850Ci, The George Carlin car
    ''73 3.0 csi, '08 535i, '03 X5 4.6is
    ...and a few other non BMW cars

  15. #15
    Join Date
    Jun 2020
    Location
    Bay Area
    Posts
    314
    My Cars
    1994 E31 840ci 2000 Z3 M
    Quote Originally Posted by cartoonz View Post
    DiveshaftPro is part of a Nationwide operation... ask them if there is a Bay Area affilliate, or just let them ship it - they ship Nationwide too.
    Reason i suggest them is that:
    A: A Brand New driveshaft from them is only about ~$600+/- > a "rebuild/modify" will be more.
    B: The new ones from them have SERVICEABLE U-Joints (Spicer), factory does not.
    C: Betcha they get it to you faster

    I've bought 1/2 dozen driveshafts from these guys and they have always been amazing.
    Hey Cartoonz, thanks for the solid input, I like that it can be repairable. What length should I give them when I call? I measured and found that the front half shaft should be 6 inches longer. If you squish all the ends, then it needs 6 1/8 inches. If you stretch the shaft, then it needs 5 7/8 inches. This is all movement from the cv joint towards the differential, so at rest (center) it needs 6 inches from the back of the transmission to the guibo on the driveshaft.

    Sent from my SM-G970U using Tapatalk

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