Cheap Mercedes-Benz B-Class Gearbox Mount

Yes, the B-Class does have a gearbox mount (also called a transmission mount) — it sits on the underside of the car and supports the gearbox casing against the subframe or body. Because the B-Class is a front-wheel-drive model across all generations, the gearbox and engine share a transverse layout, so both engine mounts and a separate gearbox mount are present. If you are unsure which mount has failed, a breaker can help you identify the correct piece once you confirm your registration and engine code.

These are different generations — the W245 ran from 2005 to 2011 and the W246 from 2012 to 2018 — and the two platforms are not the same, so a direct swap across that boundary is very unlikely. Engine families and mounting geometry changed between generations, meaning the bracket design and bolt pattern may well differ. Give your registration and engine code to the breaker, who can check the part number against your exact car rather than guessing by generation alone.

The W246 received a facelift in 2014, and while the external styling and some interior trim changed, the fundamental engine and drivetrain layout carried over on most variants. That said, ancillary mounting details can sometimes change mid-production even without a formal facelift, so it is worth confirming with the breaker against your specific registration rather than assuming any W246 mount is an automatic match. Your engine code — found on your V5 or via a VIN check — is the most reliable detail to supply.

Yes, fuel type matters because petrol and diesel units are physically different engines bolted to different gearboxes, and the mounting points and bracket geometry can vary between them. Beyond fuel type, the specific engine code is even more important — for example, a 1.5-litre diesel and a 2.1-litre diesel in the same generation may use different mounts. Always give the breaker your engine code (from the V5 or a VIN check) rather than just stating petrol or diesel.

No, trim level does not affect gearbox mount fitment — SE, Sport, AMG Line, and Urban are specification packages that change cosmetic and comfort features, not the drivetrain mounting hardware. What matters is the engine code and gearbox type (manual or automatic), both of which are independent of trim. Two B-Classes in the same year with the same engine but different trim levels will take the same gearbox mount, so focus on the mechanical details rather than the badge on the back.

Yes, this can matter — a manual gearbox and an automatic gearbox are different units with different casings and potentially different mounting bracket designs, so the mount from an auto car may not suit a manual and vice versa. When contacting a breaker, confirm whether your car is a manual, a 7G-DCT dual-clutch automatic, or another auto variant, alongside your engine code, to make sure the part they are offering came from a like-for-like donor vehicle. Never assume a mount will fit purely because the engine size and fuel type match.