Rear Lift and Air Bags...What size carrier bearing drop kit do I need?

Quick question guys! I know I need a Carrier bearing drop kit to get rid of the annoying vibration when I accelerate. There are Two sizes available from Dirty Deeds. Coach builder 0-2" Lift option and a 3-5" of Lift option for the kits. I have a Toytec add a leaf in the rear that bumped the rear of my truck up almost 2 inches. But when I Tow I am filling up my airbags quite a bit and I know the truck is more than 3" higher and I feel the vibes when towing.
-- Do I get the 3-5" kit option? Will it have an adverse affect on the driving when my air bags are not inflated and the truck is only sitting 1 1/2" to 2" high over stock? I've included the link for the kits below! Cheers!
@dirtydeeds @csuviper
http://dirtydeedsindustries.com/product/coachbuilder-carrier-bearing-drop-kits/

 

If you aren’t towing a majority of the time, I’d say get the 0-2” option. You can always get longer bolts and washers and shim the kit to have something in between the 2 options.

 

Is there a particular reason you air the bags up higher than stock ride height when towing?

I'd get the 0-2" kit. About a 3/4" inch carrier bearing drop is good for up to a 3 inch lift. Your truck will let you know if it was enough.
Also note, there is a hole in the bottom of your carrier bearing, that hole faces the ground. The mounting flanges of the carrier bearing are offset from the center so it you accidentally rotate it 180 degrees, you'll be offset in the wrong direction.

I've seen a few places tire and suspension places put them on wrong after a lift, so I like to mention it.

 

Thank you so much for your response! I have a 3" inch suspension lift on the front. The truck rides much better when I'm towing level. The Leaf pack is stock and it's done/worn out and needs to be replaced. So I have to fill the air bags up high to get the rear level with the front and I'm up at least 2-3 inches over stock height in the rear when it's done! Thank you for the additional warning to not accidentally rotate on install brother!

 

Not saying the carrier bearing drop won't help, but I'm surprised you have that much vibration. I have extended shackles in the rear to get me to probably a 2-3" rear lift (unloaded) and don't have any vibrations. I'd be wary that the bearing drop might not fix your issue, food for thought.