MMX Rear Diff Raised Poly Bush | G8x | M2 | M3 | M4

The MMX Rear Diff Raised Poly Bush is a two-position bush for the BMW G8x M2, M3 and M4, replacing the factory rear differential mounting bush. The centre section can be set to OEM height or +10mm Lifted, correcting driveshaft geometry on lowered vehicles and reducing heat and premature wear on the axle shafts. Used alongside the MMX Front Differential Lift Mount / Cradle (MMR55-1604) for the 3-point setup, and with a second bush and the MMX Dual Differential Mount (MMR55-1606) for the full 4-point setup. If you already run the MMX High Capacity Diff Sump (MMR55-1600) and the MMX Dual Differential Mount (MMR55-1606), the Front Differential Lift Mount / Cradle (MMR55-1604) and a second Rear Diff Raised Poly Bush complete the ultimate 4-point setup. Installation of the raised bush for the 3-point setup requires a BMW 33177852488 bolt. Bushes are sold individually, purchase two for the 4-point setup. The kit includes the following bolt: 1 x M14 x 1.5, 130mm: for use with MMR55-1605 (MMX Rear Diff Raised Poly Bush, G8x M2, M3 and M4) when installed in the OEM differential mount point.

The MMX Rear Diff Raised Poly Bush (MMR55-1605) is a direct replacement for the factory rear differential mounting bush on the BMW G8x M2, M3 and M4. Set to the OEM height position, it tightens up the connection between the differential and the chassis at the rear mounting point, reducing movement under load without changing the vehicle's geometry. The same bush also solves a problem specific to lowered cars. Lowering a G8x M2, M3 or M4 changes the geometry of the rear axle, placing the driveshafts under an angle they were never designed to run at. This accelerates wear on CV joints and axle shafts, and increases heat build up at the diff. Set to the +10mm Lifted position, the bush's centre section raises the rear mounting point, restoring correct driveshaft geometry and taking the strain off the drivetrain. Fitted at the front, the MMX Front Differential Lift Mount / Cradle (MMR55-1604) works to the same OEM or Lifted position, and together the two form the 3-point setup. For a full 4-point setup, a second bush is fitted alongside the MMX Dual Differential Mount (MMR55-1606), also set to match the same height throughout. What makes the bush unique is that one part covers both applications. It isn't a raised version and a stock version sold separately, it's a single bush where the centre section position at the point of fitting determines whether it's simply reducing movement, or correcting geometry on a lowered car.

Vehicle fitment

• Series: G-Series
• Chassis code: G80, G81, G82, G83 & G87
• Engine code: S58
• Model variant: All M-Cars
• Model year: M2 (2023+), M3 & M4 (2021+)

📦 Regal Autosport Shipping Policy

Shipping Destinations

We proudly ship our products across the UK, Europe, the USA, Australia, South East Asia, and other locations globally.There are no regions we restrict shipping to.

Carriers and Delivery Times

• United Kingdom: Royal Mail for small items; DPD Local for parcels up to 30kg.
  Delivery estimate: 1–2 business days.
  

• International:
  

• Small packages: Royal Mail (postal service)
  

• Small/medium/large parcels: DHL Express.
  Delivery estimate: 2–15 business days, depending on destination.
  

Please note: We do not ship on weekends or UK Bank Holidays. Orders placed after 2 PM will be processed the following business day.

Order Processing

Orders placed before 2 PM are typically processed and dispatched the same day.
Orders placed after 2 PM will be processed on the next business day.

Shipping Costs

Shipping costs are calculated automatically at checkout based on the volumetric weight of your order.
We do not offer free shipping — instead, we focus on keeping product prices as competitive as possible.

Tracking

All orders are shipped via tracked and signed-for services.
Tracking information will be provided and can be accessed via:

• Your Regal Autosport account page in Shopify
  

• The respective courier’s website
  

Customs, Duties, and Taxes

• UK Customers: Prices include UK VAT.
  

• International Customers:
  

• UK VAT will be deducted at checkout.
  

• Customers are responsible for all customs duties, import taxes, and fees applicable in their country.
  

• Delivery times may be delayed by customs clearance — time is not of the essence for deliveries.
  

Lost or Damaged Items

In the rare case of lost shipments:

• If the courier confirms the parcel as lost, we will re-ship your order as quickly as possible.
  

For damaged shipments:

• Customers must assist us in submitting a claim with the courier.
  

• After confirmation, we will replace the item or offer a discount, depending on the situation.
  

We take great care in packaging, but please inspect your order upon arrival and contact us immediately if the item is damaged or missing.

Backorders

Orders containing backordered items will be dispatched once all items are available.
We do not split ship orders. If you require partial delivery, please place separate orders for in-stock and backordered items.

Local Pickup and Delivery

We do not offer local pickup or local delivery for online orders due to security verification policies.
However, customers are welcome to visit our store and pay via chip and PIN.

📦 Regal Autosport Shipping FAQs

Where do you ship to?

We ship across the UK, Europe, the USA, Australia, South East Asia, and worldwide.
 There are no regions we restrict shipping to.

Which carriers do you use?

• UK orders: Royal Mail (small items), DPD Local (parcels up to 30kg)
  
  

• International orders: Royal Mail (small packages) or DHL Express (larger parcels)
  
  

How long will my order take to arrive?

• UK deliveries: Typically 1–2 business days after dispatch.
  

• International deliveries: Usually 2–15 business days, depending on location.
  

Please note: We do not ship on weekends or UK Bank Holidays.

When will my order be dispatched?

Orders placed before 2 PM are usually dispatched the same business day.
 Orders placed after 2 PM are processed on the next working day.

How much does shipping cost?

Shipping costs are calculated at checkout based on the volumetric weight of your items.
 We do not offer free shipping — instead, we keep our product prices as competitive as possible.

Will I receive tracking information?

Yes!
All shipments are tracked and signed for. You’ll receive tracking information by email and can also track your order via:

• Your Regal Autosport account page
  

• The courier’s own website
  

Do I have to pay customs charges or import taxes?

• UK Customers: Prices include UK VAT.
  

• International Customers:
  

• We deduct UK VAT at checkout.
  

• You are responsible for any local customs duties, import taxes, or fees.
  

Delivery times may be affected by customs clearance, and time is not of the essence for international deliveries.

What happens if my order is lost or damaged?

• If your shipment is lost, we will re-ship your order once the courier confirms the loss.
  

• If your order is damaged, we will work with you to file a courier claim and either replace the item or offer a discount based on the situation.
  

Please inspect your delivery upon arrival and contact us immediately if there are any issues.

What if my item is on backorder?

Orders containing backordered items will be held until all items are available.
We do not split ship orders. If you require partial delivery, please place separate orders for in-stock and backordered items.

Can I collect my order in person?

We do not offer local pickup or local delivery for online orders due to security verification.
However, you are welcome to visit our store and pay via chip and PIN if you wish to purchase in person.