What I mean is there are actually 8 diffrent E3 gears to choose from. Plus E1 and E2. E3 ranges from 12-19 teeth. I assume this is based on trannys and rear ends to get the correct mileage applied.

If you have a gear with the wrong amount of teeth, then you could have a slow odometer. For instance, If you took a broken odometer from an 85Sd and replaced it with a working odometer from an 84SD it should be diffrent, as the rear end gearing in an 85 is taller than an 84. Therefore, of those two instrument clusters the E3 gear would be diffrent and have a diffrent amount of teeth.

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----Adam

1985 300SD 322,000