3.636 diff installed speedo question...
Just installed a 3.636 diff with 6 speed gearbox. Runs great. only speedo is off. (not only found in australia, europe has them too)
60 km/h on the speedo = 70km/h on GPS I also looked at the speedo options and found a suitable match. BUT: it was calculated from 92+ miata's using 22teeth speedo gears. Mine is a 91 model with 20 tooth... Is there also a difference in the meter itself?? What is my best option for a fairly accurat speedo?? From my calculations: 91 model has 4.3 diff with 20 teeth sensor. New diff has 3.636 3.636/4.3x20= 17 teeth... Is that correct??? Can i use a 84-85 speedo from an RX7?? (pnp on miata speedo cable??) |
I was running the same setup. You can choose an M502-17-441 (19 tooth) gear or an M503- (20 tooth) gear, it depends on what wheel/tire combo you are using. With my 205/50R15 my speedometer was barely off compared to the GPS.
This is what I used to build the gear setup (all parts can be ordered from Mazda): 1011-17-442A - This is the sleeve/housing that will position the gear in the proper location to engage the gear within the transmission. If the sleeve that comes in a 5-speed transmission is used, the smaller 6-speed gear will be free-floating and will not engage. Thus, no readings. M502-17-441 - This is the actual gear. 9922-20-214 - Spring Pin for holding the gear in the sleeve. 9958-60-8166 - Oil Seal for inside the sleeve. 1011-17-443 - O-Ring for the outside of the sleeve. |
Thanks for the info.
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Originally Posted by hustler
(Post 529494)
Thanks for the info.
Why don't you ask for 2 of each and I'll pay you the other one? You know I can't get it myself. Let me know. |
Originally Posted by RotorNutFD3S
(Post 529477)
I was running the same setup. You can choose an M502-17-441 (19 tooth) gear or an M503- (20 tooth) gear, it depends on what wheel/tire combo you are using. With my 205/50R15 my speedometer was barely off compared to the GPS.
This is what I used to build the gear setup (all parts can be ordered from Mazda): 1011-17-442A - This is the sleeve/housing that will position the gear in the proper location to engage the gear within the transmission. If the sleeve that comes in a 5-speed transmission is used, the smaller 6-speed gear will be free-floating and will not engage. Thus, no readings. M502-17-441 - This is the actual gear. 9922-20-214 - Spring Pin for holding the gear in the sleeve. 9958-60-8166 - Oil Seal for inside the sleeve. 1011-17-443 - O-Ring for the outside of the sleeve. I have a 91 miata, that already has a 20 tooth gear... |
I wouldn't have posted the information if it didn't answer your question, but because I didn't clarify in my previous post, the 20 tooth gear you have is the wrong diameter and will not work.
Originally Posted by hustler
(Post 529494)
Thanks for the info.
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sorry to thread jack, but which one am i suppose to run with a 6 speed /w 3.9 final drive?
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