Thanks for the reply, man. Do these trucks come factory with one of those blocks? I want to measure the non factory one/ ones to see exactly what size lift i have. The rear rides rough anf i woukd like to help it out some. Any suggestions?
Some lifts use the stacked blocks. I add the two blocks together and then look for a set of blocks in that size. the air bags will add to the stiff ride
The air bags are usually added to keep the truck from sagging too much when towing.
Me I like my truck as level as possible.
Me I wouldn't want to drive around with air bags stiffening my ride
So before you go to a single block and decide on size. (As in 5"block or 6")
You need to decide on what you are going to do with the air bags.
If you keep them then measure your blocks and buy a block accordingly.
If you decide to remove the air bags, remove them before you get new blocks to see if your truck sits level. Just make sure you get your truck sitting as you want.
You could go extreme and replace springs and blocks to get your truck sitting as you want , this way you can keep the block height down to a minimum or just stay with the stock block. Let the springs do the lift.
I hope this helps and doesn't make more confusion
2012 FX4 Crew Cab, Icon 4.5 Stage III, Deaver add a leaf pack W/4" rear block, Bushwhacker Flares, Rigid
6" flood & 20" combo light, Recon Head lights, Amp steps, CB radio, M1 front bumper, 15K winch. Mesh grille By Royalty Core, Paint to match grille surround.