NO ONE makes the best lift kit. They all have advantages and disadvantages.
For 38s you will need a 6" kit.
For 40s you had better go higher although some on here will say they can get them under a 6" kit.
Fabtech had the most popular and least costly 6" lift kit. It is designed for the everyday installer. Basically it replaces the knuckles with larger ones in the front and does not require cutting of the upper control arm brackets. It does change the spacing between the upper and lower control arms when the knuckles are replaced. The lit also replaces the pitman arm but retains the stock center link and steering components.
In the rear, it does provide a drop down bracket for the panhard bar, but I do not like the arrangment on the few kits I have seen. It makes a rear end alignment difficult. And...it does not stabalize this panhard bar. We are fixing this right now on a Fabtech kit brought to our shop.
Ths shocks on this kit are adequate but not great. The front end articulation is altered with the knuckles and the shock arrangement.
Full Throttle Suspension and BulletProof Suspension kits are more expensive. They do require some cutting for the front drop down brackets. These kits are difficult to install for the average installer. They require a working knowledge of the IFS system. They are designed to be installed by pros since their installation instructions are so-so.
These kits provide a system where the stock suspension geometry is retained.
They also provide drop down steering components allowing the retention of the stock pitman arm and center link. They provide a beefed up center link system and new beefed up tie rods and end links.
They also both have adjustment methods for the rear panhard bar with a great drop down bracket.
My 6.5 FTS kit rides better than stock with a great amount of control.
Both kits come with a option for dual shocks. I use King instead of the kit supplied shocks. They are works of both art and science.
I cannot write and article today so I will end here. If you are anywhere close to NJ, let us do your work. We have either installed, fixed, or adjusted all of these lits.
By the way, stay away from the Skyjacker 6" kit.
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