Differential ratios E30,36,28,34,24,23,32,31 1987 thru 1994

[shogun]

http://www.vinesauto.com/diffratio.htm

[whiskychaser]

This is for the Euro E34s but seems to cover all of them. Some surprising changes to the ratios in there:
http://www.e34.de/frames.php

Hit 'Der E34' on the left of screen, then scroll down and click 'Differentialtabelle'