That's been the case for a very long time. I have a 1980 BMW 528i, and it's the same. BMW motor, but everything electric is Bosch, including the L-Jetronic fuel injection. Transmission is ZF as well.
Even my 1975 bmw 2002 has a getrag 4 speed manual. The m10 engine I have was still being made in the late 80s for the 318i (with electronic ignition and fuel injection), but still mated to a 5 speed getrag.
