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There's a lot more to it than that. (archive)
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Posted by John F on October 28, 2001 at 22:18:50:

In Reply to: Trany- OK. But just not the engine. There has ... posted by Kent Carlson on October 28, 2001 at 19:52:26:

The engine is all Bavarian. Unlike
Mercedes and other well known German
brands, BMW is first and foremost a
motor company. They have never built their
own transmissions in modern history.
Their manuals come from ZF and Getrag.
Although the auto in the 5 series comes
from GM, that doesn't mean it's the
same transmission that you'll find in
a Cadillac or Chevy. How many GM sedans
or coupes have a traditional longitudinal
powertrain compatible transmission? Also,
just because GM may build the transmission,
it does not necessarily mean GM builds and
tunes the controller (the part that makes the
transmission shift like it does).

BTW, many super high-end sports and lux cars
use GM automatic transmissions. It's one thing
that GM does really well.

John

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