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2nd Gen Ram Tech1994-2001 Rams: This section is for TECHNICAL discussions only, that involve the 1994 through 2001 Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
or now that I think of it, you could have a tire with a flat spot on it.. In fact, I'd be willing to bed that's the problem. Do any hard braking lately?
It's at 5 mph, 25, 40, 50, 60 and 75. It's like I'm riding on eggs. At 5 mph you feel the truck move up and down.
As stated, something is not round. You need to take it back to the shop and put is on a balancer to see what it is. It could be tires, it could be the wheels, it could be the way the wheels are seating on the hubs if you have aftermarket wheels that are not hub centric.