Second Hand Mercedes-Benz SLK Differential

The Mercedes-Benz SLK R171 generation ran from 2004 to 2011, so both years sit within the same generation, which is a good starting point. However, fitment depends heavily on the engine code of both cars, as different engines paired with different final-drive ratios and output flanges across that production run. Supply your engine code (found on your V5 or a VIN check) to the breaker, who can confirm whether the unit from a 2005 car is a direct match for your 2008 car before you commit.

The R170 ran from 1996 to 2004 and the R171 from 2004 to 2011, so these are separate generations with different platform dimensions and drivetrain configurations. Crossing that generation boundary makes a direct swap very unlikely, as the rear subframe, output flange sizes, and final-drive ratios are not shared between them. Confirm with a breaker against your registration before purchasing, but do not expect these to interchange without significant modification.

Trim level — for example SLK 200, SLK 250, SLK 300, or SLK 350 — does reflect different engines, and the engine code is what really drives differential compatibility, not the trim name itself. Two cars badged SLK 350 with the same engine code and gearbox type will need the same differential, regardless of any cosmetic or equipment differences between them. Always confirm your engine code with the breaker rather than relying on the badge alone, as some engine codes were used across different trim designations.

Yes, gearbox type matters significantly because the torque characteristics and output of a manual versus an automatic installation can result in different differential specifications being fitted from the factory. A differential from an automatic-gearbox SLK may not be the correct unit for a manual-gearbox car even if both share the same engine code. Always tell the breaker both your engine code and your gearbox type so they can match the correct unit to your car.

The R171 received a facelift in 2008, and while the core platform remained the same throughout the generation, ancillary and mounting details can change mid-production without announcement. The engine code and gearbox type are your most reliable guides across that 2008 boundary, but whether the specific unit swaps cleanly is something to confirm with the breaker against both registrations. Name the facelift year and both registrations when you contact dismantlers, as experienced breakers will know the detail of what changed.

Yes, the engine code is the single most useful detail for confirming differential compatibility on a Mercedes-Benz SLK, sitting above year, badge, or trim level in importance. A SLK 350 from one production year could carry a different engine code to another, and the final-drive ratio or flange specification may differ accordingly. Cross-reference the engine code from the donor car against your own before agreeing a purchase, and confirm with the breaker that the unit is a known match for your registration.