2/9/2023 0 Comments E46 m3 differential upgradeUse the chart below for examples of the differences. Your speed vs RPM obviously changes with a different gear set. BMW Motorsport supplies 3.91 or 4.10 options and there are other gear ratios to select in our custom builds. There's always more acceleration to be had with a shorter gear set. They could use a shorter gear because the engine redline is so high - the car has a long power band and the gear spacing allows you to stay well within that range. Gearing The E46 M3 diff comes with a relatively short 3.62 gear ratio. A custom diff is also a rebuilt unit with new seals, bearings, and limited slip unit. It's easy to forget about the rear axle when you're considering performance upgrades but changing the gearing is in the top 3 things to do to make the car faster. Not only can you get more performance but you can also address the weak points in the M Variable limited slip diff. A custom differential is one of the best upgrades to have done to your E46 M3.
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