Is it possible to have a transplant of the 5 speed box into my 4 speed 1994 Euro C180 model???? I would love to have this extra top gear for ease of driving at 100kmh or over. At the moment the 4th gear requires a great deal of stepping on the accelerator pedal to keep up with the Joneses on the highways. Even the Jap. cars are leaving me behind, looking up their exhausts. There is no cruise in my car, so I have to glue my foot onto the pedal or stuff a stick against it for the rest of the trip. Any better ideas?

If 1st gear is low enough to support this, it might be possible to modify the diff for a higher final drive ratio across the board.

Might be cheaper than a tranny.
Of course, your speedometer would need to be recalibrated as well.

Pretty flat in most of Oz, right? Higher 1st (and reverse) gear may not be a problem. Certainly would save some petrol.

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1986 300E 5-Speed 240k mi.