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Which speedo gear?? 200 1979

posted by  someone claiming to be Keith Hendrickson on  Thu Nov 9 16:12 CST 2000 [RELATED]

Hi Folks...

I'd like to know if I can change the speedo gear in my transmission to allow for some other changes i've made in my 79 242DL (M45 trans.) I've changed the rear end from 3.91 to 3.73 gears, and gone up a tire size (currently 185-75R14.) I know my speedo is off a little now, but haven't calculated how much. Does anyone know if there is a specific speedo gear I can put in to correct my reading??

Keith







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    Re: Which speedo gear?? 200 1979

    posted by  someone claiming to be Don Foster on  Thu Nov 9 22:20 CST 2000 [RELATED]

    Keith --

    The question of "which specific gear" should go to the Volvo parts counter.

    Increasing tire size and reducing the ratio both conspire to slow the driveshaft at a given vehicle speed. To compensate, you must increase the speedo cable speed. This means a smaller speedo driven gear.

    The plastic gears are color-coded — I don't remember the colors, but in my '75 245 I think I replaced the pink gear using a green gear (when I swapped in an OD tranny).

    As I recall, these gears have approximately 20 teeth, and obviously you can only change by an incremental tooth (18, 19, 20, 21, 22, etc.) or +/- 5%.



    Don Foster (near Cape Cod, MA)






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