I have a 2002 f150 fx4 with 166,000 miles on it. I recently just changed the old beaten ranchos to bilstein 4600's but my ride just got more rough. I hit a medium size dip and I started bouncing. I also just changed the torsion keys to pro comps leveling keys. My tire pressure is at about 25 pounds on all 4 and I have nitto grabblers g2 285/17. Is there a break in period for the shocks or is this how they're supposed to be?

 

It's not the shocks. More than likely the worthless leveling keys or you have other suspension components failing.

 

Rather than being judgmental right off the bat, I'd prefer to ask you a couple questions to clarify.
Did you change the keys before or after the shocks? Or all at once?

A shock doesn't have a break-in period, so that's not the case.

What do you mean specifically by "started bouncing"? When you went through the dip did your truck start moving up and down without that movement slowing quickly?

A rule of thumb I remember from auto shop classes was if you pushed down on the front or back of your vehicle (being a truck if you stood on the back bumper and "jumped" on it) and it "bounced" more than twice your shocks were likely bad. Their purpose is to limit that bouncing effect. Without shocks your vehicle would continue to bounce until it ran out of momentum.