I've noticed that whenever I begin to accelerate anywhere over 70kmph (50mph estimated) my 05 EX coupe (AT) begins to shake. Could this be an alignment issue or am I missing something completely here?
If I'm not too clear on this from here, I can explain further if asked!

 

Does it smooth back out if you get over a certain speed? Sometimes a bad tire (cupped or something) will do that. Sometimes throwing off a wheelweight so it's not balanced will do that as well.

 

If they need it anyway, rotate the tires and see if it fixes it. If so, you'll know it's tire related, and you can start there.

 

I rotated my tires just this weekend when I got 2 new rear tires. Yet it's still slightly shaky, not to sure but I'll try it again and see at what speed it's starting to shake at again. All my tires are new too, which is slightly confusing

 

have your tires rebalanced

 

A damaged CV axle can cause vibration under acceleration and may be speed sensitive. You can elevate front end on jack stands and bring wheels up to speed while observing (from a safe position) the CV axle behavior. Wobbling would indicate likely cause of CV axles.

good luck