This is what happened to mine
The speedo drive is in three sections: a cable drives out of the left hand side of the transfer box, up though the floor pan; this joins to a second cable inside the vehicle up to the binacle; inside the binacle is a right-angle drive onto the speedo head. A problem with any one of these can cause a jerky speedo.
When I had a problem, the heat from the front section of the exhaust had melted the plastic outer of the bottom cable, shortly after it comes out of the transfer box. Water had got into the cable and corroded the inner, which then frayed and picked up inside the outer tubular part, causing the jerking.
I have now wrapped that section of the replacement cable in cooking foil and underseal, to try and prevent it happening again.
Hope this helps.
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Geoffrey
1985 4-door Range Rover Classic
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