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Just bought this '08 F250 CCSB 4X4 5.4 Problem is the steering seems heavy, it tends to wander at higher speeds and won't return to center after a turn. I've searched on here and found a few possibilities (axle u joints, ball joints, steering gear, etc). I have an appointment with the dealer on Friday to fix it under warranty but he is convinced it's the u joints in the steering shaft seizing. When my F150 steering shaft began to seize, it would be hard to turn then break free then be hard then break free and this is not what is happening on the SD. I haven't had a chance to check the front end myself but not sure how you would check the axle u joints if there was no play in them. How would you check to see if they were seizing up.
Just to follow up, I checked the front end in my truck yesterday and didn't see a problem, even looked at the steering shaft in case the dealer was right about it seizing up. Guess what, it doesn't have u-joints like my F150. Shows how much the dealer knows. Anyway, I greased the axle u-joints. Took 5 pumps of the grease gun before any grease started to pump out. Gave each several more pumps then engaged the front hubs and went for a drive in 4X4. The longer I drove, the lighter the steering got and the more it returned to center after a turn. Turned off the 4X4 and unlocked the hubs, what a difference in the steering from before I greased the axle joints. If it stops raining here I plan on pumping more grease into each joint and going for another drive then grease them on a regular basis. Thanks to all who came before me and figured out the cure to this problem.