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I'm always skeptical of used suspension parts..like why did the owner take them off? What adverse effect did they have on his truck.
It's likely that he went with a full blown suspension kit, but it's just as likely that he didn't.
For the same price you can get NEW spacers from Hell Bent Steel and Autosprings on Ebay.
I echo the other comments. Pass on this and just order new. Autospring is the same price with free shipping I believe. That is the kit that I have and the front sits slightly higher due to the shell on the back of mine. I am going to add a AAL or a torsion assist to my rear to level it back out.
I had a 2.5"on mine and it leveled it out perfect.. I would suggest measuring the difference between the heights on the tallest point on your wheel wells on a flat surface and going with the closest match rounded down becuase if you put enough weight in the bed it will drop your rear an you could end up nose up..
The general concensus here and other sites is that 2.5" is about the max that your ball joints will tolerate over time. I have a 2.5 AS in my 2008 Screw and Firestone air bags in the back. It seems that if you go 2.5" in a 2004-2006 you may not need a little lift in the back. But if you have a 2007-2011 a 2" will generally put you level, and if you go 2.5" you may need a taller block, an add-a-leaf, or bags to put you level. Hope this helps.
Agreed with HYPO. Anything over a 2.5" will probably make your front sit higher than the rear plus it would cause a lot of strain on your ball joints due to the angle. I recently helped a fellow forum member install a 2.5" HBS on his '07 FX4, and it made it sit almost perfectly level. He is still thinking of getting a larger rear block so his rear won't sag when towing or hauling.