What do these markings mean?

[Naz]

I'm trying to figure out what the ratio is for this long neck dif. Is it a 4.11?
 


 
 
Sent from my iPhone using Tapatalk

[NickVyse]

Don't think they tell you anything - interesting small S stamped on there, in the style of the later painted S that noted an LSD. Easiest way to tell what you have is to rotate the shafts and count the revolutions - if you get 4 and a bit turns to one then, well, you know the answer!

 

and if both output flanges turn in the same direction you have an LSD in there, but I doubt it :-)

[Naz]

Thanks nick, it's not a lsd that's for sure. That optical illusion S is actually a 3.


Sent from my iPhone using Tapatalk

[Naz]

The original rear oil seal I pulled off the longneck is 36x52x7. The one BMW calls for is a 36x52x9. Either someone has changed it in the past and used a different seal or BMW changed the spec somewhere along the line. I'm going with the 9mm.

 

 

 

 

Sent from my iPhone using Tapatalk