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What do you believe are the benefits of swapping a ZF 8HP into an E9x N54 car? Is the TQ rating for the trans higher from the factory? Or do you just like the 8-Speed auto? The latter is subjective and I am completely content with 6AT the car came with.
And even if the TQ rating is higher AND putting aside the bell housing bolt pattern, there are zero guarantees that the electronics would be compatible. The biggest problem with have with upgrading the trans is the TCM has not been "cracked", thus none of the TQ values (TQ Converter/Clutch Pressure during shifts, Expected TQ Values, etc) can be reprogrammed for modified cars. Ironically, the 335d 6AT would be a better OEM direct-swap mod, but that trans is pre-programmed for a 5k Redline (vs. the N54s 7k Redline).
Until the trans can be reprogramed beyond the Alpina TCM Flash, expect more and more trans to slowly fail over time when combined with high power setups/regular "track" use.
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