Dodge ram shakes at 45-50 mph?

i have a 1997 dodge ram 1500 5.9L with 207,000 miles on it. its always run good but just today i went on a short errand. on the way the truck would shift fine all the way until i hit the gear around 45-50 the truck would begin to shake a lot. if i let off the gas the shaking would stop but as soon as i press it in the 45-55 region it would shake. slowly but surely i would get it past 55 and the truck would begin to not shake. i was going 65 and everything felt fine. IMPORTANT: when i would stop at a stop light and the truck still in drive i would feel the truck kind of pushing like in a pulse if you will.
 
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