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My astra H 1.8 gearbox is failing at 86k miles, I was looking at getting a gearbox off ebay but the ones on there are like +80k miles, so i think if I do buy this chances are it'll just break after few thousand miles, but i'm wondering if there's any set time these gearboxes go (i've read on here they go around 80k miles) or can they go any time?
 

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The transmissions used c.2008 with the z18xer in North America were robust Asin models.

- However, the shared radiator was a popular failure point. Check that your engine coolant is not milky in colour (indicating the radiator failed).

- Also, the shift cable end connecting to the transmission is weak; there is a cheap bushing fix.

In the US, mechanics generally do not put in new transmissions anymore as labour rates are so high. They purchase used transmissions and hope to get lucky. My transmission specialist buddy said about 90% of customer cars have no issue and he builds in the 10% failure-redo risk into the prices.

I can't speak for other Astra auto boxes.
 

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The 4sp Asin Warner box does not fail. Its a good gearbox.
What makes you think its failing ?.

Main issues are.... Radiator failing which then puts water into the gearbox oil. Destroying the gearbox.
Dirt buildup on the External Speed sensors. There are 2 of these on the box and are external. Takes 20mins to remove and clean them.
And changing the oil The gearbox should be drained and refilled ideally every 70k miles. Using correct Esso 3309, or Toyota Type IV fluid. Or AS1 specific gearbox oil. You must NOT use Dextron type auto gear oils.

There were also alot of software updates for this gearbox. The last one being in 2018, the final update.
Having the latest update applied and clearing adaptions can make for a much smoother drive.
 
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