[135Pats]

Let’s just clear this up quickly. EVERY N54 powered E8x, E9x, and E6X use the same ZF sourced HP19/21 transmission unless it is a DCT iS. There are absolutely, positively no differences in terms of the relevant hardware (tq converter, mechatronics, TCU interaction with the DME, valve body, etc etc). The E8x 28I uses a GM sourced AT, and that particular piece is made in France. It has nothing to do with the ZF units that are mated to N54s.

PS 19/21 is just nomenclature, they are the same transmission. The HP26 is the higher torque version that got tossed into the 35D. We’ve looked into a swap but the bellhousings don’t match up IIRC.