body lift or shackle?
 

wich is a more reliable lift to get just a few inches i dont really like body lifts but its an easy 3 inches to add to the truck. im currently running a 4 inch skyjacker with springs all the way around. and 33x15.50 mtz and they rub just a tad.

have you already trimmed/beat the pinch weld/fender?

if not, thats what i would do first since there just barley rubbing.

as for reliability, they are both very reliable! (assuming you don't use sheet metal for shackles, and beer cans for a BL!)

Try to find out where they rub.

You would be amazed how much easier it is to work on hard to reach places on and around the engine with a body lift. Top bellhousing bolts? piece of cake! EGR cooler plate? Non-denominator! Changing your oil filter? as quick as the Jamaicans!

haha yea man im definitly not using any beer cans for anything on my truck besides keeping me fueled to work on it... and its hard to say where they rub i have to put some wheel shims on it because they hit the spring at full turn but just barely. i went ahead and ordered the shackles i was to worried if i put the BL on it would look to big for the 33's.