Your old jeeper friend is correct, on a rare occasion, coolant from the radiator can enter the trans coolant lines and get into the trany. But, I doubt this is how this happened. Towards the top of the trans is a vent for pressure relief. When a warm transmission is submerged in cool water for any length of time, the cooling effect draws water in through the vent. What I would do is, after the trans has sat for a while, pull the pan and filter. Drain as much fluid as you can. Paying close attention to what is in the bottom of the pan. Install the new filter and gasket without glueing the new gasket to the trans, just snugging the pan bolts. Fill the trany to proper level and try it to see if it works. At this point, we don't know if it works until you try it. If everything seems to work ok, then, I would drain the pan again, reusing the new filter and drive it for a few days. At some future point, I'd drain the trans again, using the same filter, and you should be good to go. Keep in mind, water is heavier than ATF, and any water in the system is going to settle out in the pan if the vehicle sits. Judging from your first posting, I'd say you have about a 50/50 chance of no internal damage. What's laying in the pan will tell the story. Let me know.
Sunday, December 14th, 2008 AT 3:17 PM