328i's and 335i's have different manual transmissions. The 328i uses a GS6-17BG-TAU0 and the 335i uses a GS6-45BZ-THY8. The 328i also has a final gear ration of 3.91 and the 335i has a 3.23. Further the 328i has two overdrive gears, while the 335i has one.
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