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Wavetrac ATB LSD Built Differential for BMW 1' F21 LCI, 125i, M140iX with 2.81 Final Drive Axle

Wavetrac ATB LSD Built Differential for BMW 1' F21 LCI, 125i, M140iX with 2.81 Final Drive Axle

33108485723-W-1

£300.00 GBP
£300.00 GBP
Sale Sold out
Taxes included.
🚚 Order within the next 2 hours, 15 minutes for delivery by 25 Oct, 2025.
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Do you dream of a fun Limited Slip Differential for your BMW?  Regal Autosport is now stocking select BMW axles with Wavetrac LSDs fitted, offering new BMW axles with Wavetrac LSDs fitted, and offering machining and installation services to customers! Wavetrac is the most technologically advanced ATB LSD available on the market, with the patent-protected features its design delivers performance and longevity like no other. 

Find out why Wavetrac’s ATB LSD is unrivalled by clicking the link here.

Why?

Most BMW axles from 07 onwards were manufactured with a friction-welded ring gear and differential. This can cause some headaches for installation concerning vehicle downtime while the factory differential/ring gear is separated by precisely machining the parts away.

Wavetrac Europe has now solved this for the BMW 1' F21 LCI, 125i, M140iX equipped with the 33108485723 2.81. Have a different axle? Contact our team with your VIN to see if we can offer something for you. Contact Us

Axles can vary by model, trim and market supplied. Please supply your VIN prior, at or after checkout so out team can cross-check what axle BMW specify your car was fitted with from the factory, ensuring you are supplied with the correct axle.

33108485723, 33107605589 exchangeable retrospectively

5 options explained:

1) Ring gear separation, drilling, tapping of customer supplied ring gear and differential

You deliver to us your single piece ring gear and differential, we separate the ring gear from the differential, machine, drill and tap to accept bolts and a Wavetrac LSD. We ship the ring gear to you. 

2) Ring gear separation, drilling, tapping and install into customer supplied usable axle (excluding Wavetrac)

We take your usable axle you supply, deconstruct, take your original, single-piece ring gear and differential, separate it from the differential, machine, drill and tap to accept bolts, you supply us with the correct Wavetrac LSD, and we fit it to the axle. We ship the built axle to you. 

3) Supply and fit Wavetrac LSD into customer's supplied axle (pending condition) 

We take your usable axle you supply, deconstruct, take your original, single-piece ring gear and differential, separate it from the differential, machine, drill and tap to accept bolts, supply a Wavetrac LSD, and fit to the axle. We ship the built axle to you. 

4) Supply and fit a Wavetrac LSD into a Regal sourced axle (pending availability) 

We source a usable axle, deconstruct, take your original, single-piece ring gear and differential, separate it from the differential, machine, drill and tap to accept bolts, supply a Wavetrac LSD, and fit to the axle. We ship the built axle to you. 

5) Supply and fit a Wavetrac LSD into a new axle from BMW

We order a new axle from BMW, deconstruct, separate the ring gear from the differential, machine, drill and tap to accept bolts, supply a Wavetrac LSD, and fit it to the axle. We ship the built axle to you. 

Axles are supplied dry, without oil. You must fill to the manufacturer-specified level before use.

Applicable Models with 2.81 33108485723 Axle:

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