Iíve been battling this for a number of months. My trans was running hot most of the summer to the point where it boiled out of the dip stick hole. I had been checking the fluid level, which was high but didnít pay any attention to it since the dealership did the fluid swap. After it boiled over I pulled as much fluid I could, 5 quarts, out of the dip stick hole and replaced it with only 3 quarts to the point where was at the ideal marks on the dip stick. Temps immediately when down to normal and drove great. I blamed it on the dealership overfilling it.

Now a month has past, still running cool, but I checked the trans fluid level and is now well above the hot temp marks even after the Jeep has sat for 24 hours. I also checked my coolant level and it was down below the min line.

I was always under the assumption that the trans cooler was trans fluid based and not coolant based and the two systems were separate. All that I can figure is that radiator fluid is finding itís way into the transmission to have these fluid levels changing. But how is this possible??

2015 JKUR AEV JK350
1985 CJ8 Scrambler