I have a 2004 Durango ST 4.7L at 122,000 miles. I took it up to dodge they said i need to flush my transmission and power steering immediately. My truck runs awesome and sounds great but I was wondering why when I am on an inclined plane/ hill my truck will not accelerate it will stay at the initial speed or it will decrease quickly in speed? Just yesterday for the first time i was going up a curvy hill so speed was no option the truck went from 30 to 10 to a complete stop at the top of the hill, then it jerked to switch gears and continued as normal. It freaked me out I only had the truck for 2 weeks and it has never done that before. Is this a result of the flush I need or what ? I am aware it is tune up time as well. So will the tune up and flushing do my truck any justice ? Dodge said there isn't any major issues.