Not sure if it helps but mine started doing similar about 10000 miles after a complete rebuild but upon changing the engine and they completely changed the gearbox oil again as it was out it solved it.
They did put genuine oil back in it not sure what they told me is true but they said other spec oil isn’t quite the same as what Volvo use please don’t moan at me for that only going by what I was told but it did drive a whole lot better after.
Not sure if the oil goes slightly thinner than Volvo oil and causes minor loss of pressure which causes it but only guessing.
When it was rebuilt it wasn’t Volvo oil in it only the right spec they told me. I changed the oil in my gearbox with a different oil over the years and it was ok but never quite right so I will be sticking to Volvo oil in the future.
Last edited by Danielpsmith; Oct 23rd, 2021 at 21:38.
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