My TD (1987) also reads the wrong speed. This is because the Carrier (Differential) has been changed to a different gear ratio. It's tough finding a used/rebuilt Carrier for the 1987, so I had the Indy put one in from a 1987 sedan.

Is there a way to adjust the Speedo/Odo to make it read right??

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1987 300TD 440K - My car
2005 Jeep Grand Cherokee Laredo 107K - Tim's car
2000 - CLK320 100K - Deb's car
1994 C230 150K - Josh's Car