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K100-forum.com » Technical, repair and troubleshooting » Engine and transmission » 16 spline drive VS 20 spline drive?

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stilbo

stilbo
active member
active member

Help! Bought a 32/11 drive box. Guy says it's from an '85 K100. It has 20 splines and mine has 16. Trans is a 16 spline. Shoulda researched this. Mid year change? Any alternatives? Universal joint and yoke look to be non-removable. Do I own a $150 20 spline boat anchor? 


Can I just get a good 20 spline drive shaft and count on it having 16 splines on the transmission end?



Last edited by stilbo on Tue Sep 02, 2014 5:45 pm; edited 1 time in total (Reason for editing : Update)

    

kioolt

kioolt
Silver member
Silver member
After checking with realoem.com I saw that the drive shaft changed after 2/1986.  A further showed that the rear drive also changed after 2/1986.  The transmission output shaft appears to be the same all the way through the K1100's.  So it looks to me like you could get a before 2/1986 drive shaft and it should work.


__________________________________________________
2004 R1150RT 186,800 miles 
1991 K100LT 128,700 miles
1982 R100RT 106,900 miles
Total 422,400 BMW miles

AMA,BMWRA,BMWMOA


The cheapest thing on a BMW is the nut that connects the handlebars to the seat.
    

stilbo

stilbo
active member
active member
Wow! That's great! Thank you!
But did you mean to say that a post 2/86 shaft will work with my 20 spline box and '85 transmission?

    

kioolt

kioolt
Silver member
Silver member
Yes, I believe you are right about a post 2/1986 drive shaft.  If you would like to double check my work, take a look at realoem.com.  The K100's are listed in the archive section.  Once you find a part number you can put it in "PART NR APPLICATION SEARCH"   to find out what other bikes it will fit.


__________________________________________________
2004 R1150RT 186,800 miles 
1991 K100LT 128,700 miles
1982 R100RT 106,900 miles
Total 422,400 BMW miles

AMA,BMWRA,BMWMOA


The cheapest thing on a BMW is the nut that connects the handlebars to the seat.
    

kioolt

kioolt
Silver member
Silver member
On second thought you would need a pre 2/1986 drive shaft since you have a pre 2/1986 rear drive.


I just gave it another look.  I'm getting confused.  The supplemental information for pre 2/1986 is z-16.  I'm assuming that means 16 splines.  The supplemental for post 2/1986 says z - 20.


__________________________________________________
2004 R1150RT 186,800 miles 
1991 K100LT 128,700 miles
1982 R100RT 106,900 miles
Total 422,400 BMW miles

AMA,BMWRA,BMWMOA


The cheapest thing on a BMW is the nut that connects the handlebars to the seat.
    

Rick G

Rick G
admin
admin
All the transmissions had a 16 spline output shaft


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1999 K1100 LT with a Big Block 1200
    

stilbo

stilbo
active member
active member
Thank you both for your help!
I REALLY appreciate it!
I'm starting my search for a drive shaft now....

    

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