Wavetrac
Wavetrac ATB Limited Slip Differential Refundable Deposit Only - BMW F20 F22 F30 (M140i, M240i, 340i) Core Exchange
Wavetrac ATB Limited Slip Differential Refundable Deposit Only - BMW F20 F22 F30 (M140i, M240i, 340i) Core Exchange
Heads-up on cancellations & returns: if you cancel an order or return an item, you won't get back 100% of what you paid. We apply a 10% restocking fee, the outbound shipping is non-refundable, and we have to pass on Shopify / PayPal payment processing fees; these aren't returned to us when we refund you. International orders also lose on exchange-rate spread in both directions. If the original packaging is damaged or missing, a reboxing charge applies. For international orders specifically, if you refuse to pay our shipping invoice or supply a prepaid label after placing the order, the same deductions apply. We're upfront about this — please be sure of your purchase before ordering.
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Refundable Core Charge for Wavetrac Helical Diff Upgrade – BMW F-Series M140i, M240i, 340i
This listing is for the returnable core charge only. It lets you receive the Wavetrac helical torque-biasing centre first, then send your original rear final drive back to us on an exchange basis. Ideal if your car is your daily and cannot be off the road. Once your like-for-like unit is returned in good order and the original Wavetrac packaging is included, we process your refund.
Who this helps
- Owners of F-series M140i hatch, M240i coupé and 340i saloon looking for a rear axle traction upgrade
- Drivers wanting an exchange scheme so they can swap diffs without downtime
- UK buyers searching for a core return option for a Wavetrac gear-type LSD
How the core exchange works
- Purchase this refundable core charge if you cannot send your standard unit in advance.
- We ship the Wavetrac helical differential centre with the correct packaging.
- You install the upgrade, then send your undamaged original final drive casing back with the Wavetrac box.
- After inspection and approval, we issue your refund for this deposit.
Return window and condition
- Return your original unit within 2 months from the date you receive the upgraded assembly.
- The returned casing must be free from damage and suitable for reconditioning.
- The original Wavetrac box must be included to qualify for the full refund.
Why enthusiasts choose this upgrade
Wavetrac’s helical gear design delivers confident power delivery out of bends, sharper corner exit drive and consistent stability in poor weather compared with an open rear end. It is a proven choice for fast-road and track-day use, with excellent manners in daily driving. We run this setup ourselves and our customers consistently praise the transformation in grip, balance and confidence.
Compatible applications
F-series M140i, M240i and 340i models listed in the product title. If you are unsure about fitment, contact us for guidance before ordering the deposit.
Search terms customers use
BMW M140i diff upgrade, M240i rear diff, 340i performance diff, F20 F22 F30 helical LSD, gear type differential, torque biasing diff, rear axle upgrade UK, performance final drive, fast road differential, track day diff, Wavetrac UK supplier, BMW B58 diff upgrade, F-series rear end upgrade, core exchange diff, core return surcharge, refundable core charge BMW, helical LSD BMW, traction upgrade BMW 1 Series, 2 Series diff upgrade, 3 Series 340i differential.
Professional fitting
We recommend expert installation. MJ Modifications in Warwickshire can supply and fit. For a fitting quote or to book, email info@mjmodifications.co.uk.
Part number
30.309.172-DEPOSIT
Brand
Wavetrac
Important note. This item is the refundable deposit only. The performance differential unit is sold separately.
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