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Thread: Speedo correction

  1. #1
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    Speedo correction

    I'm quite happy rolling around on 32's but sometimes forget about the inacurate speedo, is it possible to correct by changing the drive gear in t/case ?

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    MY08 TDV6 SE D3- permagrin ooh yeah
    2004 Jayco Freedom tin tent
    1998 Triumph Daytona T595
    1974 VW Kombi bus
    1958 Holden FC special sedan

  2. #2
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    Are you sure it is inaccurate? I found it changed mine to be spot on with the GPS.

    Cheers
    Will

  3. #3
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    You can, and pretty easy to do. With an LT230 t's only the plastic gear you need to mess with as the steel drive gear on the output shaft is the same in all variants. AFAIK.

    Gear colour indicates how many teeth. Think there is a post around somewhere with a complete list of them.
    You just need to work out or check what colour gear is in there now and calculate how many teeth you need for correction to select the appropriate colour to fit.

    Changing just involves removing the transducer (or gear carrier if you have speedo cable) from the output housing and swapping the gear.
    2 min job if the t/case is on the bench, but is more fiddly in the vehicle.

    Steve
    1985 County - Isuzu 4bd1 with HX30W turbo, LT95, 255/85-16 KM2's
    1988 120 with rust and potential
    1999 300tdi 130 single cab - "stock as bro"
    2003 D2a Td5 - the boss's daily drive

  4. #4
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    Quote Originally Posted by MR LR View Post
    Are you sure it is inaccurate? I found it changed mine to be spot on with the GPS.

    Cheers
    Will
    31's its spot on but 32's its out by 5k at 100kph.
    MY08 TDV6 SE D3- permagrin ooh yeah
    2004 Jayco Freedom tin tent
    1998 Triumph Daytona T595
    1974 VW Kombi bus
    1958 Holden FC special sedan

  5. #5
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    Quote Originally Posted by steveG View Post
    You can, and pretty easy to do. With an LT230 t's only the plastic gear you need to mess with as the steel drive gear on the output shaft is the same in all variants. AFAIK.

    Gear colour indicates how many teeth. Think there is a post around somewhere with a complete list of them.
    You just need to work out or check what colour gear is in there now and calculate how many teeth you need for correction to select the appropriate colour to fit.

    Changing just involves removing the transducer (or gear carrier if you have speedo cable) from the output housing and swapping the gear.
    2 min job if the t/case is on the bench, but is more fiddly in the vehicle.

    Steve
    I have possibly seen that somewhere but was going by memory which may or may not have been correct, i will have a search later on.
    MY08 TDV6 SE D3- permagrin ooh yeah
    2004 Jayco Freedom tin tent
    1998 Triumph Daytona T595
    1974 VW Kombi bus
    1958 Holden FC special sedan

  6. #6
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    Looky here:
    Speedo Drive Worm Gears

    Steve
    1985 County - Isuzu 4bd1 with HX30W turbo, LT95, 255/85-16 KM2's
    1988 120 with rust and potential
    1999 300tdi 130 single cab - "stock as bro"
    2003 D2a Td5 - the boss's daily drive

  7. #7
    Join Date
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    Thanks Steve, now i just need to work out which gear will correct the speedo.
    MY08 TDV6 SE D3- permagrin ooh yeah
    2004 Jayco Freedom tin tent
    1998 Triumph Daytona T595
    1974 VW Kombi bus
    1958 Holden FC special sedan

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