i have rough country 4.5 full leaf packs with stock shackles. when going over bumps im hearing a thud from the rear. i though it was the shocks so i pulled out and hit some bumps and it still does it. from what i can tell nothing it hitting anything.
im thinking it could be my shackles. im just kinda stumped and its a really annoying sound. its a pretty good thud.

 

shackles you need extended ones for the RC leaf pack. when the leaf compresses the stock shackle smacks the frame. JKS has good shackles that have a bend in them so it takes a lot for them to contact the frame

 

Re check your u bolts? I'm not to sure. There's not much back there. Maybe rear sway bar?

 

then why would they have me use the stock ones

 

what swaybar? lol i think ive only heard of one person keeping the rear swaybar

 

dont know but when I did my friends we couldn't even use the stock shackles because the pack is too short end to end. if you look at the shackle angle on a RC pack is like / with the shackle pointing towards the front of the rig. you really want the shackle like \ pointing towards the rear.

 

yea it makes sence rc is slacking

 

i have the same problem after doing my 4.5" RC leafs...its the only negative thing I have found with the lift.

 

Mine did the same after my lift. Mine is the bushing on the shackle. Its gonna thud for a while becuase I dont have the time to take it off.

 

I just dont want to put a shackle in the back and have the back sit an inch higher

 

it will still look mean...

 

check to see if the shackle is hitting the rear bumper bolt mine doe this

 

in this area

 

mine looks a lot like the above picture, but angled farther forward towards the front of the truck.

 

maybe its hitting in the front then ?????