My 98 chevy silverado 5.7L constantly shakes while driving. Changed out shocks

[SID]

but still instable? Problem? I have changed out the shocks, had front end alignment, and had wheel rotate and balance but the problem still exists. Wondering whats the problem?

[oodlesoanimals]

Yep, it could be all the things that these guys up there have mentioned...and it could also be a bent or loose drive line.
Try checking out all of the easy things first....things that you can do yourself.....cheaply. And go from there.
Good luck