Quote:
Originally Posted by Phil Waterman
A hint this is both about checking the level and putting lube in. If you have ever had trouble get lube in this may explain why.
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I'm only guessing here, but if the filler hole is obstructed internally it can cause the oil to flood back out suddenly, giving the impression of full. I recall this happening on some car gearboxes in the past, and you have fill them very slowly to avoid floodback. It taught me not to trust floodback as an indication of full, and always wait for it to subside and do the finger check again. The temptation is to quickly put the filler plug back in to avoid a big mess on the floor, but that can lead to underfill.
I must confess though it never occurred to me to change gears, perhaps because I was working on lots of different cars and I never became familiar enough with their gearbox internals. However the problem is severe enough on some cars that you can't even insert the filler nozzle properly, and you have to hold it place and pump the oil in excruciatingly slowly. Maybe that's the case with the Chev gearbox in neutral...?