Bad Vibration

Hello! I have a 90' Chevy Silverado 4x4. I have just replaced the engine. Truck had about 220,000 miles on it b4. Just had my tires balanced because the truck was shaking at about 40mph. But now when I hit bumps it starts to shake real bad until I slow down to about 15-20mph. My truck isnt equipped with a steering stabilizer. Anyone have any ideas what could be bad??

Could be a number of things. The best way to find out is get under it with a pry bar and check for any play on the various steering components. Of course be careful how and where you pry.