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post #1 of 1 (permalink) Old 04-20-11, 03:41 PM Thread Starter
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66 Mercury Cyclone speedo problem

I am having a problem getting the right speedo gear combination for the Borg Warner T10. The problem is the pencil gear does not engage the steel drive gear on the tailshaft. I have tried a number of driven gears and it is the same problem with all of them. It is just barely missing as I can apply slight pressure on the gear housing and it will start to turn. I have done a lot of work on the computer and what I have found out is that there may be more than 1 drive gear but they are hard to find. Here are the dimensions on the gears that I have now. The driven gear is 1.910 diameter, the pencil gear is .772. I should mention that this is a trans I bought and not the one originally in the car. Is there a bigger pencil gear available? The hole in the tailshaft would accept at least .100 larger. Also the speedo goes in on the drivers side. Any info would be helpful.

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