Manual Swapping A W124 Or 190E: The Parts You Need

Most W124s and 190Es sold in Europe left the factory with an automatic, and there is nothing wrong with a four speed Mercedes auto. But these cars were engineered with a manual as a factory option, the parts exist, and a five speed transforms how the car drives. It is one of the few modifications on a classic Mercedes that makes it more like it could have been rather than less original.

It is also a job that people start and do not finish, almost always for the same reason: they bought a gearbox and assumed that was the hard part.

It is not. The gearbox is the easy part.

Why people stall halfway

A manual conversion is not one job, it is about eight. Drivetrain, pedals, hydraulics, linkage, tunnel, electrics and interior trim all change. Miss one and the car does not move, and the missing item is usually a bracket that nobody lists and no scrapyard bothers to keep.

The way to do this is to have every part in a box before the automatic comes out. A car on axle stands waiting six weeks for a pedal assembly is how projects die.

The parts list

Broadly, in the order you will need them.

Drivetrain

• Gearbox. The five speed manual from a donor. Which one depends on your engine and its torque, so match it to what you have rather than to what is cheap.
• Bellhousing or adapter as appropriate to your engine and gearbox combination.
• Flywheel to suit the manual clutch. An automatic has a flexplate, which is not usable.
• Clutch kit, disc, cover and release bearing. Fit new. Doing this twice means removing the gearbox again.
• Gearbox mount and crossmember. The manual box mounts differently and the automatic crossmember does not fit.
• Propshaft. This is the one people miss. Automatic and manual cars use different propshaft lengths because the gearbox output sits in a different place. Get the correct one for a manual car, with a good flex disc and centre bearing while it is out.

Pedals and hydraulics

This is the part that stops projects, because it is not something you can improvise.

• Manual pedal assembly. An automatic car has no clutch pedal and no mounting for one. You need the manual pedal box, which brings the brake pedal with it. We stock the W124 and W201 manual brake and clutch pedal assembly with cylinder, A1242900419, which saves the usual search.
• Clutch master cylinder and its pushrod, plus the reservoir feed.
• Clutch slave cylinder and the hydraulic line between them.
• Bulkhead grommets and the correct fixings. Small, cheap, and infuriating to be without.

Shifter and linkage

• Gear selector and shifter assembly. We have the W124 and W201 five speed manual shifter, A1242670305.
• Shift rods and bushings. Renew the bushings regardless of how the used ones look. Worn linkage bushings are the reason a swapped car feels vague, and people blame the gearbox.
• Tunnel and console trim. The automatic console has a different aperture. You will want the manual surround, and this is a good moment to fit decent wood trim since the console is already out.

Electrics and the small stuff

• Reverse light switch on the gearbox, and its wiring.
• Starter interlock. An automatic will only crank in park or neutral. That circuit needs dealing with or the car will not start.
• Speedometer drive. Check whether your donor gearbox matches your cluster's expectations, mechanical or electronic.
• Starter motor. Sometimes different between automatic and manual applications. Verify for your engine.

Verify part numbers against your own car

Being straight about this: the exact parts depend on engine, model year and market, and the W124 ran from 1984 to 1995 with changes throughout. Treat the list above as the shape of the job rather than a shopping list to order blind.

The reliable method is to read the part numbers off your own car where the part carries over, and to confirm the rest against a parts catalogue for your exact chassis number. Tell us your VIN and engine and we will check what fits before you spend anything.

Things worth knowing before you commit

Paperwork. In much of Europe changing the transmission type is a notifiable modification. Check what your country requires before the car is in pieces, not after.

It is not a cheap way to make a car quicker. A manual makes the car more engaging and slightly more efficient. It does not add meaningful power. If you want speed, spend the money on the engine.

Do the clutch and the rear main seal now. Both are trivial with the gearbox out and horrible with it in. Same for the flex disc and the gearbox mount.

Budget for the small parts. People budget for the gearbox and forget that bushings, seals, grommets, fixings and a propshaft add up to a meaningful fraction of the total.

We are in Europe, and we hold this stock

This is the practical difficulty with manual swaps: these were European market options, so the parts are here. If you are in the US or Australia, sourcing locally means waiting for someone to break a manual car, which does not happen often, and cores get expensive.

We are in Europe with a large stock of manual conversion parts for the W124 and W201, including the pedal assemblies and shifters above, and a good deal more that is not listed online at any given time. Brackets, linkages, crossmembers and trim.

The best way to do this is to send us a list. Tell us your chassis, engine, year and where you are shipping to, and we will tell you what we have on the shelf, what we can find, and what you should source locally. We would rather send one complete box than have you discover a missing bracket with the car on stands.

While you are in the interior, the console being apart is also the moment for the instrument cluster and a steering wheel. A manual car with a rebuilt wheel and a thicker rim is a genuinely different thing to drive.