what are the possible damage that may result on a transmission overfilled with fluid?

my cousin is in town and told me that he is bored, so i asked him to service my 300Ds transmission with new fluid and filter. he is pretty much mechanically oriented so i dont have any problems with him working on my car so i let him do it while taking my nap this afternoon.

when i woke up, it's already done and drove him to one of his ex-girlfriend's and i drove back home.in the garage, i saw all 10 quarts of the mobil1 atf that i bought are all empty which appears to me that he poured all of them to the tranny. so as soon as i found out, i checked the fluid level, and there it is!!! the level is way beyond the hot/max line with the engine warm, at park and idling.

actually it is all my fault because i didn't tell him to use only 7 quarts out of the 10 atf.

did i damaged the tranny after driving it with an overfilled fluid at approx 60 miles back and forth in the interstate?

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'85 300D Turbo - CA Version

You didnt say it acted any different during your drive so probably will be fine.

I would drain 4 qts into a VERY clean container, check the level and top off to the correct level.

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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)

Pop the plug on the pan and drain the pan. Add a quart the start it up and let it idle... just refill correctly.

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I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]

yeah, it didn't act or behaved anything unusual for now, so far, but my concern is if it made some internal damage on the seals, valves, and bands. thanks for the advise anyway!

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'85 300D Turbo - CA Version