Sorry you are still having issues. Check LKQ and Row52 in your area. You might get lucky and find a cheap ($150-250) used transmission at the "you pull it" junk yard. The 6HP does not go bad often so there is not a lot of demand. It was used until 2013 in the diesel. And get aggressive with "Make Offer" on ebay. Smart sellers will see that there 40+ for sale and take a few hundred in profit.

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2009 35d, 2006 325i & 330i