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Originally Posted by cheerio
They will have different torque converters, and possibly different gear ratios.
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I have asked xHP support if 320i N43 gearbox will work:
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Yes, all BMW derived 6HP21 HW#7591971 are compatible. The overall gear ratio is changed by a different Rear differential ratio, so you can take the transmission itself from any model.
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So it seems that 6HP21 HW#7591971 320i N43 should be suitable too.
Should I completely trust them?
I will ask them does torque converter differ if the gearbox would be from N52.