first off, i'm no genius when it comes to transmissions, but aren't transmissions for diesel engines generally geared differently(taller i believe) to fit their powerband best. so i would think that the gearing for the 335i wouldn't work on the 320d that well.
also, doesn't the 320d have an inline4 diesel engine? maybe the transmission for the 335i is more costly or difficult to modify to work how it should for the diesel application(assuming im correct above) and bmw decided its easier and cheaper to source another transmission for that particular model?
thats the only thing i can come up based on what i know about transmissions why bmw decided not to use the same transmission. If im totally off then disregard my post and please dont flame me haha. im only trying to help. take care and everyone that resides in america, HAPPY INDEPENDENCE DAY!
teri
***EDIT**** sorry i didn't realize you guys were talking about the 335d...if that makes my post useless then please delete it :-)
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