BMW Differentials
 

Product Categories

testimonials

BMW Race Differentials

BMW F3X 328ix after 3/14 Differentials

 
$1,299
Please Choose
*This is our own custom machined limited slip carrier and is the best on the market
We recommend using the OE Castrol SAF-XJ 75w140 with FM Booster for builds using the M Variable Limited Slip. For the Quaife, Wavetrac and clutch systems we recommend the Redline 75W110 Fluid.
+
Diffsonline builds a wide variety of BMW differentials in house to accommodate the several different differential housings used in modern BMW's. We start by cleaning the differential housing, then select the industry's finest ring and pinion gears, apply the desired clutch packs and options, and finally carefully assemble the housing to be shipped to your door.

The first decision to make when buying a custom differential is to determine the gearing you want. The gear ratio determines the number of revolutions of the wheel for every revolution of the drive shaft. The higher the gear ratio, the more RPM's an engine must turn to keep your speed constant. Take a look at our RPM / MPH chart in Technical Information to see how various ratio's may affect your cars performance.

Once you have selected the desired gear ratio, you must determine to what degree do you want limited slip. Limited slip comes with several options from open to 75% and variable ramp lockups. You also can specify the amount and type of clutch's for the differential.

Lastly, there are some upgrade options that may be selected including ring and pinion polishing for reduced friction / lower temperatures, upgraded rear covers, as well as miscellaneous bolts and fluids.

F30

Models:
  • 328ix

F31

Models:
  • 328ix