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Will a auto transmission shift gears if it has been overfilled?
Carmella
overfilling the trans. will not effect trans. operation. If it is not changing gears properly, it is not because it was overfilled, rather, other problems occur. If a trans. is overfilled too much, the fluid will either runout at the vent tube or be "puked" out the filler tube. I disagree. Overfilling can allow rotating parts to foam the fluid, reducing its effectiveness, interfering with valve body functionality, and lugging the transmission. Here are quotes from a couple web sites supporting this: "Overfilling transmissions wastes power and can ruin oil seals, so check oil levels with the unit hot." "Overfilling an automatic is bad. Remove the extra oil before you have problems. Don't wait for symptoms to appear. Once they do, the transmission can be toasted. Too much oil can cause foaming, and once it foams it loses it's lubricating properties, plus the volume greatly expands. That just creates more foam, and once you have enough, it will come out the vent, and usually the dipstick."
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∙ 17y ago
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