I just installed the 5100s adjustables front/back with a 1.5 block in back and 1.5 adjustment up front. I have the stock pirellis that everyone hates and now i have annoying bed bounce/vibration when i hit bumps. I havent done the alignment yet. Any ideas? Normal? The ride is great, but a little stiff and my rear end vibrates now when i hit potholes, bumps, etc.. Any ieas would help, thanks to all!

 

Try getting your tires balanced.

 

Its only when i hit bumps etc. Its very smooth otherwise.

 

Do the alignment first, and let us know.

 

Did you check to see if the bolts are tightened?

 

i have the same thing. 09 plat, stock rims, 275 or 285 70 20. cant remember size right off the top of my head for some reason. they are good year wrangler silent armors.
i too get a bit of bed bounce. i dont have rear blocks, but bilst all the way around. set to full rise in front.
it rides great but on concrete, bumps can get crazy. still tracks on road right after bounce . better / hardly noticable with load in or towning.