And the transmissions from e36 and e39 (early-mid 2000s) are built by GM. There is actually a lot of cross platform and cross manufacturer parts rattling around

And the transmissions from e36 and e39 (early-mid 2000s) are built by GM. There is actually a lot of cross platform and cross manufacturer parts rattling around in our vehicles. Honda is a great example of modular components. Taking a d-series and swapping it with a b-16/18/20 and even k-series with just a change in motor mounts/axles/ecu. It takes an afternoon to swap it over. Of course as you get further into the aftermarket realm things like bolt-in conversions for swapping 2jz into 90s mustangs becomes possible. Fabbing up some brackets isn't that hard, conversely, desoldering a cpu or dealing with non-modular computer components is a much more daunting task to me. The parts are too small and fragile.