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BMW Differential and Gearing Upgrades

Upgrading various parts of the differential can have tremendous benefits in your car's performance. It's easy to forget that the differential is a source for making your car faster and handle better so it's often overlooked. The engine is not the only place to make the car faster. Our differential options vary from gearing upgrades to limited slip conversions. You can purchase the ring & pinion gear sets on their own (professional installation required) or have us build a diff around your own specifcations. The options are almost endless! Every custom-built diff is fully rebuilt with seals and bearings. We also design and supply bushing options to reduce driveline wind-up, finned differential covers for better cooling, and more!

Ratio Changes - Changing the differential gearing is one of the best and most-effective upgrades you can make on any BMW (old or new). By using a shorter (numerically higher) final drive ratio you are increasing your RPM relative to road speed - this puts you in a more powerful RPM range than before! Since you're in a 'meatier' part of the power band you're now putting down more power/torque to the ground. If you can trade outright top speed for faster acceleration at daily speeds then this is the perfect upgrade for you.

Limited Slip Upgrades - Sadly, many BMWs today are not equipped with a limited slip (posi-traction) differential. BMW has tried to compensate by using traction control that cuts power at the engine or applies the brakes to retard wheel spin (or a combination of both). But nothing beats the function and feel of a a true LSD which may be why BMW continues to use them in M cars. Our LSD upgrades can be done a number of different ways - a factory-type limited slip unit with either 2 or 3 clutch packs, helical type, OS Giken unit, or something truly custom. We can also vary ramp angles and setup to change the limited-slip behavior under acceleration, deceleration, and cornering. Need a custom diff? Call or e-mail to have a quote.

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OEM Rein Magnetic Differential Oil Drain Plug - M22x1.5 - Most BMW & Mini Models
OEM Rein Magnetic Differential Oil Drain Plug - M22x1.5 - Most BMW & ...
2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!
Rein - Corporate Logo
T#:38890943
Part#: HWU0065
In Stock
$ 23.99 USD
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$ 23.99 USD
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As components in the differential begin to wear, metal particles become loose in the diff fluid, which can lead to excess wear. This magnetic plug pulls these particles out of suspension, helping to reduce wear over time. Replaces BMW # 33117525064
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Victor Reinz Differential Rear Axle Shaft Seal with Lock Ring - E46 M3, E9x M3, E39 M5 and more
Victor Reinz Differential Rear Axle Shaft Seal with Lock Ring - E46 M...
Victor Reinz - Corporate Logo
T#:7917
Part#: 33107510289
Ships in 1 Business Day
$ 25.44 USD
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$ 25.44 USD
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Leaking differential output seals? Replace yours today with this OEM replacement. This seal measures 76x50x10.
OEM BMW Rear Differential Mount - E46, E83 X3, E85 Z4
OEM BMW Rear Differential Mount - E46, E83 X3, E85 Z4
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Febi - Corporate Logo
T#:12525
Part#: 33176751808
In Stock
$ 44.99

This product was last offered at the strikethrough price on
04-18-2026

$ 27.99 USD
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$ 27.99 USD
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RUBBER MOUNTING REAR:331020
Victor Reinz Shaft Seal with Lock Ring - Differential Output Shaft (76 X 50 X 10 mm) - E28 E31 E32 E38 E39 E46 E60 E63 E64 E90 E92 E93 Z4
Victor Reinz Shaft Seal with Lock Ring - Differential Output Shaft (7...
Victor Reinz - Corporate Logo
T#:596464
Part#: 33107510289
Ships in 1 Business Day
$ 22.99

This product was last offered at the strikethrough price on
05-07-2026

$ 22.00 USD
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$ 22.00 USD
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Differential Bushing - Priced Each
Differential Bushing - Priced Each
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Febi - Corporate Logo
T#:382582
Part#: 33171131903
Ships in 5 Business Days
$ 28.03 USD
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$ 28.03 USD
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Genuine BMW M Performance Limited Slip 2.81 Differential - F22/23 F3X
Genuine BMW M Performance Limited Slip 2.81 Differential - F22/23 F3X...
Genuine BMW M Performance - Corporate Logo
T#:402424
Part#: 33108659989
In Stock
2% off MSRP $ 3,370.00

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 3,310.99 USD
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2% off MSRP
$ 3,370.00

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 3,310.99 USD
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Ensure your getting all the power you can to the road with this LSD from BMW Performance
Victor Reinz Shaft Seal - E38, E39, E60, E61, E63, E64, E65, E82, E88, E92, Z4
Victor Reinz Shaft Seal - E38, E39, E60, E61, E63, E64, E65, E82, E88...
Victor Reinz - Corporate Logo
T#:362359
Part#: 33107505605
Ships in 1-2 days
$ 29.99

This product was last offered at the strikethrough price on
05-07-2026

$ 28.99 USD
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$ 28.99 USD
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Seals the axle into the differential
Genuine BMW M Performance BMW M Performance Limited-Slip Differential - F22 228i M235i F23 M235i
Genuine BMW M Performance BMW M Performance Limited-Slip Differential...
Genuine BMW M Performance - Corporate Logo
T#:222981
Part#: 33108659987
Ships in 1-2 days
8% off MSRP $ 3,370.00

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 3,100.35 USD
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8% off MSRP
$ 3,370.00

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 3,100.35 USD
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For the ultimate in track day performance, the M Performance Limited Slip Differential is here! The clutch-type mechanical differential features a 30% lockup on acceleration and 9% lockup on deceleration. The differential works with the existing DSC system to provide excellent traction wet or dry. It uses the stock 3.08 final drive ratio that the stock M235i uses, so fuel economy will not be affected.  This item fits the following BMWs:
2014+  F22 BMW  228i M235i
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Victor Reinz Differential Cover Gasket - E31, E32, E34, E39, E46, Z4
Victor Reinz Differential Cover Gasket - E31, E32, E34, E39, E46, Z4 ...
Victor Reinz - Corporate Logo
T#:362602
Part#: 33108305033
Ships in 1 Business Day
$ 3.01 USD
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$ 3.01 USD
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Seals the rear differential cover
Differential Oil Drain Plug
Differential Oil Drain Plug
2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!
Rein - Corporate Logo
T#:27405453
Part#: 33117525064
In Stock
$ 14.99

This product was last offered at the strikethrough price on
08-03-2026

$ 9.99 USD
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$ 9.99 USD
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Rear Differential Bushing - Priced Each
Rear Differential Bushing - Priced Each
We Price Match - Give Us A Call or Chat!
Febi - Corporate Logo
T#:349051
Part#: 33171134872
Ships in 3 Business Days
$ 10.99 USD
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$ 10.99 USD
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Victor Reinz Sealing O-Ring - E23, E24, E28, E30, E31, E32, E34, E36, Z3
Victor Reinz Sealing O-Ring - E23, E24, E28, E30, E31, E32, E34, E36,...
Victor Reinz - Corporate Logo
T#:375022
Part#: 33111206166
In Stock
$ 2.03 USD
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$ 2.03 USD
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Used to seal the pulse generator in the differential case
Rein Differential Drain Plug Gasket
Rein Differential Drain Plug Gasket
2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!
Rein - Corporate Logo
T#:19654
Part#: 07119963355
Ships in 3 Business Days
$ 2.03 USD
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$ 2.03 USD
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GASKET RING for various sensors and seals.
Febi Drain Plug Gasket
Febi Drain Plug Gasket
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Febi - Corporate Logo
T#:340702
Part#: 07119963355
Ships on Oct 6, 2026
$ 1.99 USD
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$ 1.99 USD
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22x27 aluminum sealing ring
Febi Rear Differential Carrier Bushing - E53
Febi Rear Differential Carrier Bushing - E53
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Febi - Corporate Logo
T#:382583
Part#: 33176770456
Special Order: No Guaranteed ETA
$ 44.99 USD
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$ 44.99 USD
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Bushing that presses into the rear subframe at the rear of the differential.
Differential Mounting - Rear Axle, Front
Differential Mounting - Rear Axle, Front
Febi - Corporate Logo
T#:56471642
Part#: 33316792873
Special Order: No Guaranteed ETA
New Item
$ 12.99 USD
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$ 12.99 USD
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The Febi Bilstein Rear Axle Differential Mount provides factory-spec structural retention to keep your differential firmly anchored.
OEM Febi Rear Differential Carrier Bushing - Rear Positiom - E82/88 E84 E83 E9X Z4
OEM Febi Rear Differential Carrier Bushing - Rear Positiom - E82/88 E...
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Febi - Corporate Logo
T#:382585
Part#: 33176770866
Back Ordered
$ 47.99

This product was last offered at the strikethrough price on
08-12-2026

$ 34.99 USD
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$ 34.99 USD
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Shaft Seal with Lock Ring - Differential Output Shaft (43 X 90 X 10 mm)
Shaft Seal with Lock Ring - Differential Output Shaft (43 X 90 X 10 m...
Meistersatz - Corporate Logo
T#:599651
Part#: 33107564416
Ships in 1 Business Day
$ 17.99 USD
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$ 17.99 USD
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This item fits the following BMW Chassis: E70 X5,E89 Z4,F01,F02,F06,F10,F12,F13,F15,F16,F22,F25 X3,F26 X4,F30,F31,F32,F33,F34,F36
Rear Differential Bushing - Priced Each
Rear Differential Bushing - Priced Each
2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!
Rein - Corporate Logo
T#:592387
Part#: 33171134872
Back Ordered
$ 18.99 USD
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$ 18.99 USD
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