2006-2008 BMW Z4 Differential 3.23. Removed from a 2007 BMW E85 Z4 with a 6 speed manual transmission and only 32k miles. In good working condition, fully tested prior to removal from the vehicle. The fluid has been drained with no metal shavings or abnormalities. The housing is in good cosmetic condition with no major surface rusting. Differential showed no signs of fluid leaks during testing. You will need to reuse some of your existing hardware for installation. This differential has a 3.23 final drive ratio. Will fit ANY 2006-2008 3.0si equipped with a 6 speed manual transmission. Will NOT fit any Z4M models. This assembly may fit other trim levels of Z4, however the final drive gear ratio will be different.