On my 2006 1-ton, after putting my 2" leveling spacers on top of my 6" BDS suspension lift (the short arm kit), i have noticed no vibrations or anything, but the ride has gotten extremely rough. It's fine most of the time (a little harsher than stock) until I hit a large bump, then it feels like it's almost bottoming out, or bouncing. Do you guys think it's the shocks bottoming out? or just that i'm running 8" of lift on short arms?

 

8" of lift with short arms. At 8" you kinda need to go with a long arm kit.

 

i think it's a combination of both...but the major factor is the short arms...
find some long arms (good luck with that) , have someone build you some, or talk to don about some radius arms. you can do a search for one of my posts about my radius arm setup.