98 maxima tire / tranny shake?

I have a 98 Maxima GXE with 101k miles. Having troblem with a shake when I am accel from stop and turning left or right. It started after new drive axles installed. I have had align done, tires balanced a couple of times, and another set of axles installed with no help. Shop says to take to dealer for transmission problem(auto trans). Anyone out there with similar problem or knows a fix?