Quote:
Originally Posted by Tantibus
Thanks for the reply!
I’m honestly not too sure, it’s likely because I’m putting down too much power, but I was sure that the bottom end would be able to handle the power gains.
I did check out realoem.com, wasn’t lucky enough to find the part I needed.
Thanks so much for your help though!
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Hmmm, I think this should be the page for your car.
https://www.realoem.com/bmw/enUS/sho...diagId=33_2122
This is the differential for an October 2014 build, right hand drive, rear wheel drive 420i with an automatic transmission. If that info is correct (less the build date, I just guessed yours) then it looks like you should have a 3.15 final drive ratio. Hope that helps! If any of that info is wrong, post the exact details of your car and I can take another look.