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Hj premier speedo cluster or cable out?

Hi there i have a 1976 HJ premuer with a speedo that reads about 20kph to fast at 100kph i have replaced the driven and drive gear according to rare spares calculator. The needle does not bounce. It still reads 20kph to fast... any suggestions?

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Most likely tyre size, which means you've to change the driven gear to the tyre & diff combo.
Here's a handy calculator to play with.
http://www.centauria...

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HOLDEN DOCTOR

it will be the gearbor drive gear you need to change it to suit

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Is there anyone with experience regarding incorrect speed reading 'after spedo drive and driven gears have been eliminated as potential causes? E.g. speedo cluster perhaps? Rare spares mentioned faulty cluster was the likely cause given gears have already been changed appropriately...

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Check your odometer against one of those 5 km measured sections on the freeway.

If the odometer is correct, then your speedo needs recalibrating. If the odometer is out then the gearing is incorrect.

A rule of thumb that I use, says that each tooth on the driven gear is worth around 5 km/h @ 100 km/h. So if your speedo is reading 20 km/h too fast @ 100 km/h, then increase the driven gear teeth count by 4 (e.g. 17 to 21).

Dr Terry

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If the speedo is faulty & needs repairs, Attspeed in St Marys in Sydney metro, does automotive instrument repairs.
https://www.attspeed...

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