I'm at 349K on my 02 4.0 XLT. I've had all of the typical issues with electrical components, like switches, broken wires, regulators, etc., but I managed to get about 250K before I had to get the transmission rebuilt.
I'm having the same issues again, flashing O/D light, missing 3rd, 5th and reverse. I'm on the fence about doing anything about it since this ride has been so good to me. It would cost me more to buy another vehicle, so I may just fix it again.