I had the 04.5 CDT also. Should have kept it. Never went back to the dealer in 60000 miles and never gave me a bit of trouble. I believe it ran better (pulled harder) and at least 4 more mpg. 04 could accelerate up any hill pulling any load. New truck in the shop 2 or 3 times in the first 2500 miles. After the last re flash it has not been back but with the pollution stuff I expect it will be seeing the dealer more. Less cooling capacity and runs hotter. More rattles. Fuel filter is much harder to change. Shop manual says remove front wheel and fender liner. You have got to be kidding!! To change a fuel filter? Haven't tried it yet so I cannot say for sure there is no other way. Its the whole canister you replace not just the filter. Cannot let it idle long or the DPF will fill causing a trip to the dealer. They cheapened up the rear under seat fold out storage. Went from metal to plastic.
Six speed is nice and so is the exhaust brake. 4 speed was fine also. 6 speed doesn't seem to want to downshift on the hills and so you have to do it manually otherwise its smooth. Tow haul it hits the gears hard especially on the downshift. In traffic you will want to manually choose a lower gear to avoid sea sickness. Great getting off highways when loaded. You rarely have to use much brake on an exit ramp. The exhaust brake does a good job.
I only got rid of it because we went from a TT to 5th wheel and wanted the long bed dualie. I wouldn't consider it an upgrade yet. Hold off till they get things worked out. Just my opinion. Your mileage may vary.
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