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Thread: Diff ratio tyre size speedo gear (pinion)

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    Expert TuffTD42's Avatar
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    Diff ratio tyre size speedo gear (pinion)

    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
    Tyre Pinion
    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.

  2. The Following 7 Users Say Thank You to TuffTD42 For This Useful Post:

    fixer982 (18th May 2011), Lexx (21st July 2014), Mrowka (30th March 2011), mudski (19th April 2021), Plasnart (2nd December 2018), snicko (5th May 2011), YNOT (28th March 2011)

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    SPAMINATOR growler2058's Avatar
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    well done cheers mate helps to sort out the dark art of speedo v tyres v ratios

    IF YA DONT GET STUCK YA AINT TRYIN HARD ENOUGH........OR YA TOOK THE CHICKEN TRACK

    WARNING: TOWBALLS USED WITH SNATCHSTRAPS DO KILL!!

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    Banned Bigrig's Avatar
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    Top find and post mate!!! Well done and thanks!!

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    Legendary big_fletch's Avatar
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    Great Post mate, im sure will help out a few members at some point
    Qualified Auto-Electrician
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    Dont own a Patrol or any 4WD at the moment, hopefully will change into the future

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    BIG & BALD MEGOMONSTER's Avatar
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    This will come in handy, that's for sure.


    Sent from the secret chambers of our secret society, on a secret iPhone, with a secret pin code and eye retina scanning from a secret peep hole, just don't tell anyone OK, cos it's secret........
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    Top marks TD42
    Drive is 04 DX wagon, 165Ks, Dual Batts, 12000kg Warn in steel bar, Snorkel, Xray 220 Hid Spots, Cruise, digital EGT, Draws in back with power box, 40Ltr Waeco for the essentuals

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    Last time i got some gears from nissan. not many in stock in australia. not sure if their is after market parts.
    005 GU PATROL 4.2TD WITH SAFARI TURBO, SNORKLE, LONG RANGE TANKS,BULL BAR ,DUAL WHEEL CARRIER, ROOF RACK, TIGER WINCH, STEERING DAMPER , REAR DRAWS AND ENGEL SLIDE,35L WATER BLADDER.

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    Lexx (21st July 2014)

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    Thanks mate, an unexpected help for a problem I thought I'd have to just 'follow the traffic' for!

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    Patrol Guru
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    You can adjust the GQ's speedo

    There is a trim pot on the dash pcb - I have posted details elsewhere
    1991 GQ LWB 4.2 Carby dual fuel, 32 mud claws, 2 inch lift, LSD's front and back

    And its Toooooooo High for the Ball & chain

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    how good are you, excellent home work, I have cross checked your post and you are 100% correct with your ratio verses pinion drive gear again WELL DONE

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