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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 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 2,3 or 4 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 misc
bolts and fluids.
Please Select the model of BMW you have to
see what options are available for you car.
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 We cannot accept unauthorized returns. Please e-mail, call, or write us regarding problems with an order for assistance or return authorization number. Returned parts must be unused, in original condition, and in original packaging and received by Diffsonline LLC no later than 30 days after sale for a refund. No return will be accepted without a return authorization number. No returns are allowed on custom built products, including but not limited to differentials, and any custom fabrication. Returned items are thoroughly inspected before a refund is issued. There is no refund on special order items. A 20% restocking fee will be charged to all returns not due to our error. There is no refund for any shipping charge on returned items. |
