I have a spreadsheet back home with all the flywheel, bellhousing, casing & drive shaft part numbers I could find from the early 60s to the late 70s. In that range, the rule is simple. There are exactly 3 variations.

- The clutch uses a fork.
- The clutch uses a lever.
- The bellhousing is wierd.

It should be possible to switch the first two around, I never tried, so I don't know.

The wierd cases are the M189 & the V8s. The V8s have their own bell housing. The M189 gets its own bellhousing. Also, the V8 presumably has a beefier set of bearings, but since benz over-engineers everything anyway, I'm not sure that it really matters.

Basically, all the straight 4s, 5s & 6s will swap directly. Your biggest worries are the drive shaft length (it changes from automatic to manual), the ratio of the rear differential and finding the pedals & shift lever hardware that are correct for your model.

In other words, go for it.

-CTH