Talking of overfills - Auto tranny

[ScottyCBoy at aol.com]

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In a message dated 6/17/2002 12:40:51 PM Central Daylight Time,
rob3 at hod3.fsnet.co.uk writes:


>
>
>
>     Chaps,
>
>     A post I saw on overfills, prompts me to ask this.
>
>     I recently changed the Dexron in my '88 100 Avant (drained and removed
> the pan) and overfilled slightly.
>
>     The system including convertor is stated as holding 3Litres. I put
> about
> 2.5 Litres. Now with the engine warm and transmission in 'P' the dipstick
> reads nearly 1/2" too high. The cars done maybe 1000 miles since and is
> behaving fine. Could anyone tell me what (if any ) the dangers are in this
> situation? I'm quite happy to drain off the excess by loosening the fill
> tube connection at the pan but wondered if theres a better way or product
> to
> syphon off the excess if need be?
>
>     Cheers

Overfilling an auto trans can cause the trans oil to be whipped into a froth
much like a hot cup of cappucino. The froth will then be sucked up by the oil
pump which will cause it to cavitate. This could potentially lead to early
trans failure as an oil with air in it dosen't compress like the pure fluid
would and can result in low fluid pressure on the pistons in the trans.