91 Dodge Grand Caravan shakes from 35 to 40?

I have 91 Dodge Grand Caravan front wheel drive. when accelerating from 35 to 44 the right front when seems to shake not so much felt in the steering as in the frame and well feeling via
the seats.. after 45 it evens out and stops shaking but if im slowing from say 50 down through 30 it never shakes.. and if im going up hill its even worse but only in the 35 to 40MPH range..
Any thoughts and ideas on what this could be.. would like to have an idea before taking it to a mechanic..
Thanks for the help. Shane
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