To clarify some mis-info, GM makes quite a few different transmissions (and has for years) - the trans in "Mullets'" moms' van was a disaster project from GM (turbo 200) those vans were a disaster to start with. The typical GM trans (turbo 350 & 400) are extremely reliable and there are millions of them out there - Buicks, Cadillacs, Chev/GMC trucks, etc. The reason BMW auto trans (aka "GM version) gets a bad rap is the load/gear ratios of BMWs' diffs - and the lack of regular maintenance. If you do the fluid/filter changes every 50k you'll have no problems. If you drive it hard then do the filter changes more often like every 30k.