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Originally Posted by east302
If it was overfilled, it may have vented the excess fluid and would guess that is has some type of mechanical pressure relief valve in it. On our 2003 Tahoe (4L60E...I know, not the same) there's a rubber vent tube near the top of the tranny where fluid will leak from. Ours needs a rebuild as the pump will froth up all the fluid out the vent on long trips and then stop leaking for days or weeks sometimes. In your case I'd just watch the fluid level and hope that it was due to the overfill done by the dealer.
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when you check the transfluid do so when hot on level ground....it is very important the the vehicle be level and hot ....the pump will create bubbles when it is over filled.....also if you overload your vehicle and the transmission overheats,,,,,,towing with the trans in over drive this also will occur so get a transmission cooler installed to reduce temps in transmission.