Well I tried to think ahead. I took some of my old 4 speed gearbox to bits to see if I could swap over the speedometer drive parts so when I fit the 5 speed to the 190E with the differential for the 4 speed box all will be good on the gauge.
The tail cone sections / end sections are very different =>
You can see on the 716.217 tail cone - that's the one on the left - that the cog on the output shaft is bigger and the drive for the speedo cable is about 1mm smaller in diameter than the 717.412 tail cone - which is on the right.
So if you hear of a "swap the tail cone" suggestion - jump all over the bugger who said that!
Next step - was to think OK fit the cogs from one casing in the other =>
...as you can see they are of different thicknesses...
...so I had visions of making spacers to fit the difference in width. Luckily I didn't go off on that tangent for too long. The biggest problem is the diameter of the larger 716.216 shaft cog - it doesn't fit in the 717.412 casing =>
So that's that.
I'll have to have an external adjustment thingumyjig to correct for the 4 speed diff on my W201.
