Is it possible to have an accurate speedometer and an inaccurate odometer at the same time? Is there a frictional coupling between the speedometer and the odometer? I have a 1984 300D with a speedometer that appears accurate, but the odometer seems to register lower than it should.

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Tom Evans
69 280SE 91K (wish I still had it)
73 220D 98K
78 300D 134K
78 300D 185K
81 300SD 301K (still have)
82 300SD 321K (still have)
84 300D 268K
84 6.2 Diesel GMC Suburban 225K (a whole different story!)