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S Chassis Technical discussion related to the S Chassis such as the S12, S13, S14, and S15.


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Old 07-18-2016, 11:48 AM   #1
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Speed sensor pinion questions

Have a base 96. Totally stock 4.09 rear diff.

Bought a R33 rear diff with 3.69 (R200 version)

I would like the speedo to read correctly. What I have found is that my VSS pinion gear is most likely 20t. If I move to a taller FD, in this case by 10%, I need to lower the pinion by said 10%? So down to a 18t VSS pinion.

If I'm incorrect in my thinking please correct, if I'm correct where can I find a 18t pinion? This is where I'm getting this info http://zilvia.net/f/showthread.php?t=240385

So can anyone provide the 18t part number or a place to get one?

Found a part number 32703-78102. Will it fit?

Last edited by VegasNow; 07-18-2016 at 11:59 AM.. Reason: info added
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Old 07-18-2016, 12:08 PM   #2
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dakota digital sgi-5 box will fix this issue i believe
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Old 07-18-2016, 01:14 PM   #3
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Originally Posted by RB25GUY View Post
dakota digital sgi-5 box will fix this issue i believe

Sure looks like it! And it doesn't look that hard to use and I can use it for just about any trans set up. Thanks!!
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Old 07-18-2016, 01:20 PM   #4
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No problem man, any time!
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