farmall Posted August 25, 2015 Share Posted August 25, 2015 Hello monte lovers. I recently installed a muncie 4 speed in my 72 monte with 350. I have an 8 tooth drive gear and a 19 tooth driven gear for the speedometer. According to a calculation using the gear ratio and tire size, I need to have an 18 tooth driven gear with my 8 tooth drive gear. I bought one, dropped it in and the speedometer was way off, showing 15 miles under the actual speed. I removed it thinking that I should have counted the teeth before I put it in. When I removed it, I found that the teeth were messed up. Figuring that I didn't get the teeth meshed, I threw it out and put the 19 back in until I could get another 18. I got my second 18 and it did the same thing. I did take my time, using a number 1 square bit screwdriver while pushing it in to get things lined up. Is there something I am missing? Why is this happening. I am going to attach some pics but they are not the best. I have tried in many angles with different amounts of light and these are the best. Quote Link to comment Share on other sites More sharing options...
Sam (Bones) Posted August 25, 2015 Share Posted August 25, 2015 if the driven gear is in good condition, I would suspect the speedometer cable is dragging and needs to be lubed or replaced Quote Link to comment Share on other sites More sharing options...
farmall Posted August 25, 2015 Author Share Posted August 25, 2015 Maybe. But it seems to work fine with the 19 tooth, only showing 5 mph less than actual speed. Quote Link to comment Share on other sites More sharing options...
Sam (Bones) Posted August 26, 2015 Share Posted August 26, 2015 are you sure you ordered the correct gear? sometimes you need a different driven gear Quote Link to comment Share on other sites More sharing options...
Murphy Posted August 26, 2015 Share Posted August 26, 2015 Is that driven gear the right length? It looks short to me?? Also, the speedo cable doesn't have any sharp bends in it, right......... Quote Link to comment Share on other sites More sharing options...
farmall Posted August 26, 2015 Author Share Posted August 26, 2015 I will have to remove my 19 tooth to compare it. They all seemed the same length. Ire there different length ones available? My speedo cable is bent with gentle curves. 1 Quote Link to comment Share on other sites More sharing options...
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