Quote:
Originally Posted by ACJBMWPVD
Why when swapping the engine and trans do you have to swap the subframes? Why not just have a driveline shop build new driveshafts? Are the diffs bigger 328 to 335? I’ve done motor swaps on other platforms…e91 is a new platform to me. Thanks.
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There's a lot of variables here. Generally you don't have to swap rear subframes as they're the same between 328 and 335. but there are a bunch of little changes between chassis and changes between diffs. Usually you can cobble driveshaft halves together, reuse axles etc..If you're staying auto to auto or awd to awd etc it's not bad. When you start doing things like me where you go auto awd to manual rwd everything needs swapped.