From the rear, there is an ear on the housing on the lower right, with the ratio stamped on it.

I have not read your other threads noted, but if the speedo is off higher & lower, possibly the wrong speedo or diff ratio, but the needle would have been re-indexed to create both errors as simply the wrong speedo/ratio would cause it to always be low (or high). Same with the odometer.

Sluggish off the line might be due to the 300E starting in 2nd gear unless you manually select 2 before starting or floor it with a properly operating trans/bowden-cable/kick-down switch.

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Gone to the dark side

- Jeff