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Here's a list of pinions to suit tyre sizes with accompanying diff ratios to get your speedo within specs. It worked for me for engineers. Got my speedo within 4% which is NSW law. cost from Nissan at the time $74. Or you can pay $220 for a Tyre match box. Cheers Jono.
Diff ratio Tyre size Speedo gear (pinion)
Part Number i.e. 4.11:1 ratio running 31” tyres 32703 - 31G 17 Change last 2 digits for gear you need.
3.9:1 Ratio TyrePinion
31 16
33 15
35 14
37 13
4.11:1 Ratio
31 17
33 16
35 15
37 14
4.375:1 Ratio
31 18
33 17
35 16
37 15
4.625:1 Ratio
31 19
33 18
35 17
37 16
Last edited by TuffTD42; 28th March 2011 at 03:00 PM.
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