Drivetrain

Drivetrain Parts for Motorsport, Swaps and Precise Fitment

Main category overview: this parent group covers the key parts of the driveline system, meaning the components that change torque transfer, connection geometry, clutch release behaviour or shift feel. Based on the live assortment, it is not built around one product type only: the real structure spans differentials, clutch and flywheel hardware, engine-to-gearbox conversion parts, clutch hydraulic lines, and dedicated quick-change racing differential components.

Technical background and system integration

Load-path logic: every drivetrain part works as part of the whole system, so a differential, clutch, flywheel, gearbox adapter or shift linkage should never be judged in isolation. Even within the same engine or chassis family, differential casing, spline format, gearbox input shaft or clutch stack height can change the correct choice.

The visible range currently includes mainly Quaife LSD units for BMW and Mercedes applications, an MFactory Honda LSD, PMC conversion flywheels and gearbox adapters, HEL braided clutch lines, PMC 184 mm / 7.25", 228 mm and 240 mm clutch and flywheel solutions, plus Winters Performance and Bulldog quick-change hardware.

• Differential side: LSD units, helical/ATB-style options, some crown wheel and pinion sets, plus adapter parts for selected applications.
• Clutch side: complete clutches, clutch discs, pressure plates, clutch covers and hydraulic lines across multiple makes and project types.
• Conversion branch: flywheels for conversion, gearbox adapters and adapter kits for BMW, Honda, Toyota, Nissan, Mercedes-Benz, GM, Ford and more.
• Shift branch: gearbox bushings, linkage joints, shortened levers and short shifter options, including DCT/DSG/PDK-related entries.

How to choose the right one

Quick selection guide: because this is a parent category, start with the main technical question in your build. If the issue is traction split, locking behaviour, diff casing or final drive, the wheel-side branch is the right place to begin; if the job is connecting an engine to a gearbox, the adapter and conversion-flywheel branch is the faster path.

If your starting point is wheel-side power transfer, begin with Differentials, because that branch separates BMW, Mercedes and other LSD-oriented applications more clearly.

• Road or track car: start with platform, driven axle and use case in the differential, clutch and flywheel branches.
• Swap project: choose by engine family, gearbox code, clutch diameter, spline format and starter-side geometry.
• Shift feel: gearbox bushings, short shifters and linkage joints become relevant when the goal is control precision rather than a full torque-path conversion.

Installation and failure-prevention tips

Preparation: on mechanical branches, clean threads, flat mating faces, dry test-fitting and the correct assembly sequence matter most. If your job sits on the clutch-line branch, Degrease using a manufacturer-recommended cleaner, then allow to dry completely before applying load/boost.

Common failure point: inside a broad parent category like this, the usual problem is not one obviously wrong part but two parts that seem right on their own and do not work together once assembled. A mismatch in gearbox code, spline, clutch diameter or differential-casing pattern can leave the system with preload, awkward fitment, vibration or inconsistent operation; prevention starts with choosing the correct branch and verifying every interface detail before final assembly.

If your build is based on engine-to-gearbox conversion work, Flywheels for Conversion is a useful next step because that branch shows engine family, gearbox code and clutch-side layout together on the product cards.

• Trial fit: before final tightening, confirm that holes, threads, centring points and mating faces align without forcing the parts together.
• Recheck: after first startup or first drive, inspect for seepage, unusual noise, clutch release-point changes, shift-feel changes and fresh vibration.

PRO TIP: inside a broad drivetrain category, identify the system side first (diff, clutch, flywheel, adapter, hydraulic line or shift mechanism) and only then compare part numbers or prices.

FAQ

Which subcategory should I start with if I only know the project direction?
If the question is traction, locking behaviour or final drive, start with the differential branch. If the task is pairing an engine to a gearbox, the conversion flywheel and gearbox-adapter direction is usually the faster route.

What is the most common failure or installation mistake?
Work through this order: platform, differential or gearbox code, spline, clutch diameter, bolt or hole pattern, then the notes shown on the product card. If any one of those points is only assumed, stop and verify it against the removed hardware as well.

How is a flywheel for conversion different from a gearbox adapter?
A flywheel for conversion also changes clutch-side and starter-side geometry, while a gearbox adapter mainly bridges the interface between engine and gearbox. Many swap projects need both, but they do not solve the same problem.

When should I look at clutch lines or gearbox bushings?
Clutch lines become relevant when pedal feel, hose routing or hydraulic reliability is part of the job. Gearbox bushings or linkage joints matter when you want to tighten shift precision, reduce play or improve the mechanical feel of the linkage.

When is the Winters or Bulldog branch relevant?
The Winters Performance and Bulldog DMI branches matter when the build uses quick-change or dedicated racing differential hardware. At that point you are looking beyond a normal road-car differential swap and into specialised housings, internal parts, flanges, shafts and related hardware.