Used Mercedes-Benz SLK Transfer Box

No — the SLK is a rear-wheel-drive only sports car across all generations (R170, R171, and R172), and was never offered with four-wheel drive. A transfer box is a component found in 4WD and AWD vehicles to split drive between axles, so the SLK simply never had one fitted at the factory. If you're searching for a drivetrain component, you may actually be looking for the gearbox, differential, or propshaft instead.

Almost certainly, yes — since the SLK is rear-wheel drive only and has no 4WD system, there is no transfer box in the driveline at any point in its production history from 1996 to 2015. Your garage may be referring to the automatic gearbox, the rear differential, or possibly the propshaft, all of which are legitimate wear or damage items on these cars. It's worth going back and asking them to confirm the exact part name and its location on the vehicle before you search for a used replacement.

Yes, very much so — the R170 (1996–2004), R171 (2004–2011), and R172 (2011–2015) generations each used different gearbox and differential units, and within each generation the engine code is the most important detail for ensuring the correct unit. The engine code is found on your V5 or via a VIN check and should be the first thing you give to a breaker when requesting a quote. Never assume a unit from a different generation or engine variant will interchange without confirmation from the breaker against your registration.

The R171 received a facelift around 2008, and while some mechanical components carried over, ancillary and mounting details can change across that boundary in ways that aren't always obvious. For drivetrain components like the gearbox or differential, the engine code remains the primary guide, but you should always confirm compatibility with the breaker against your specific registration. Don't assume a pre-facelift unit is a straight swap without that check.

The SLK200, SLK250, SLK300, and SLK350 badges indicate different engines rather than cosmetic trim levels, so they do directly affect which gearbox or differential you need — these are not cases where trim makes no difference. Each engine variant (identified by its engine code on the V5) may use a different gearbox type or ratio, so quoting the engine code to a breaker is far more useful than the badge alone. Giving the breaker your full registration and engine code will get you the most accurate match.

Because the SLK has no transfer box, focus your search on the specific part you actually need — gearbox, propshaft, or rear differential — and have your engine code ready, as this is the single most useful detail for a breaker to match the correct unit. Your engine code appears on the V5 registration document or can be retrieved via a VIN check, and is more reliable than quoting the year or badge alone. Let the breaker cross-reference against your registration to confirm fitment before agreeing a purchase.