I'm hitting 200,000 miles on my 2005. Changed the water pump and replaced wheel bearings and control arms.

Not sure if its an issue on yours, but the governor pressure and shift solenoids on mine have crapped out twice. Not a terribly difficult fix and I take the opportunity to adjust the bands. There are some very good tutorials on youtube. Also, its always a good idea to change transmission fluid fairly often on these. Otherwise, I've had no problems.

Now, I will say that if you don't do a lot of towing, any fuel savings you have from driving the diesel will be offset by your maintenance costs if you drive a lot. Everything for this truck is just more expensive and, god help you if you every have an injector or injection pump failure, because you are talking serious money with either one of those.

personally, I'm looking to sell mine and get a gas-powered truck.