I upgraded to bilsteins when i ordered the kit. Heres a pic of my old truck,kinda going for the same look with more tire tho.

 

Only reason I said that is because IF you are doing serious enough offroading that you have to disconnect the sway-bar, there is a chance that the spacer could "pop out" of place. Probably would never happen, but trying to seriously flex can do some weird things. If it were me, I would rather just have an 8" coil spring as opposed to a 6" spring with 2" spacers. But, you have to remember, these are 3/4 and 1 ton trucks; very few people actually take them off-road a lot. Unless of course you are one of the desert racing guys out east. And for the most part, they have smaller performance lifts anyways and they all come with coils.

 

I wont be offroading. Only offroad it'l see is on muddy pastures.

 

Then I wouldn't worry about it. You'll be completely fine. It's probably fine even if you are doing some moderate off-roading, but I like to be on the safe side. If all you see is muddy pastures, then go for it!

 

your ride quality may suffer with the spacers (on top of the lift) due to the increased angle of the control arms.

 

i only have 2" spacers and im running 35-13.50-20s with 4.5 backspacing. had to do a bit of custom trimming. i would think 37s would clear ok with the extra 2.5 inchs from the fabtech. i had the fabtech 6" on an 02 ford supercrew. loved it except the factory ball joints wouldnt hold up

 

you need a minimum of 6" lift to assure yourself of clearing 35's with wheels that have 4.5" bs. 5" bs and a pos offset will assure you of clearing 35x12.50x17's with 4.5" lift.