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Stretch · #58 09-15-2013, 07:59 AM

Quote:

Originally Posted by SuperCow

Why would you want to change the speedo gears?

Is measuring the output shaft right?
So then only your dif en wheelsize matters?

Only if Mercedes would use different gearing in de speedogears?

So i would figure if you only change the gearbox but not the dif, you don't need a other speedometer. If you change the dif aswell, then you need a other speedometer

(btw you do need a longer speedocable, the 4-speed doesn't fit)

Quote:

Originally Posted by SuperCow

I'm pretty sure with the W201 model the speedo-gearing in the transmission is the same(even for automatic).
So if your using the same dif/wheelsize, your fine.

Its the speedometer that is different, having a K number. (For the W201 1.8 there 7 different odo meters (not counting the miles version))
Howto speedometer: 190Rev.net - Discussion for Mercedes-Benz 190E W201 Performance, Parts, Tuning and more

You are correct - I stand (and sometimes sit) corrected.

I did a bit of hunting about for data but I can't find the speedometer part numbers just yet. The gearing of a worm drive is given here =>

Worm Gears

In both the 4 speed gearbox and the 5 speed gearbox the helical gear on the output shaft has 6 starting threads. The cog on the cable drive has 15 teeth.

Using relationship on the roymech site linked above Rg = 15 / 6 = 2.5