Conversation Between Mark Kovalsky and heaffie

The first thing I would think is to see if it's overheating. What temperature did it reach? Are there any codes stored in the computer? Is the fluid overfilled?

I have a 2003 F250 4x4 crew cab FX4 with the 4r100 transmission. It stays cool when normal driving but I hooked a trailer to it the other day and it was an equipment hauler with nothing on it. The transmission was close to overheating so I pulled over and let it cool. It did blow some fluid out of it. The transmission seems to downshift and upshift constantly under the least bit of acceleration. The truck has around 207000 miles and Im unsure or when it was serviced. Fluid is a little dark. Transmission cooler and AC condenser are clean as can be. I have done a lot of reading on the forums but don't know where to start.