Join Date: Apr 2002
Location: Dandridge (Near Knoxville), TN, USA
I don't know if BMW even phases them at assembly. Strangely, nothing is mentioned in the service manual about it.
Some BMW techs know they should be phased, but many probably don't. Any decent mechanic knows that this is something that should be done, and you can read about it in many places.
Vibration is the result if they are not phased correctly, and it gets worse as the angle between the parts increases. Even phased correctly a standard universal joint coupled shaft will have a slight speed variation between the ends as it goes through a complete turn. That is why Constant Velocity joints were developed, and are on most short drive shafts that move up and down a lot, such as to wheels on independent suspension systems. The LT drive shaft fits this scenario, but CV joints are large, heavy, and expensive.
I don't want to achieve immortality through my work...I want to achieve it through not dying.
EX: '01 Black LT, BAT BYKE (Totaled at 110,000 miles)
IBA SS, BB, BBG, 10/10ths.
No bike now, but maybe in the future.