80 280SL, 85 300SD, 87 300TD, 90 300TE 4Matic, 90 300D 2.5 Turbo, 92 300D 2.5 Turbo, 92 300TE 4Mat
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Generally it will be at the back end where the guts of the transmission are finally turning at the same rate as the drive shaft, the rotations of which equate to a calculation of your rate of speed. If it were on the front end you would likely be measuring your RPM instead.
