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Message: <blockquote data-quote="astroboy" data-source="post: 722972" data-attributes="member: 4527">For the mid gear, GM is longer ratio, more suitable for diesel application. Can drag or we say "tarik". The 325i M Sport all using GM box since day 1. While the non M Sport using ZF. All LCI 320i using this box while all LCI 325i already M Sport, so uses this too.ZF is shorter ratio, frequent gear shift. All pre-LCI both 320i and 325i, even the 335i using this box except the 325i M Sport, not sure about the 320i M Sport.Low gear and Final drive about identical.ZF is famous for spare parts availability. So can replace every item within. GM box spare parts are scarce. Usually people replace the entire box than repairing a damage box. Chop shop should have many compared to ZF.So each has it's pros and cons..To determine which box you having. Just check out the bottom ATF pan. If metal, then GM. If black plastic, then ZF.For E90 ATF, ZF uses ZF LifeGuard6, yellow fluid. GM uses Dextron VI, red fluid.</blockquote>