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3" in a spacer is TOO MUCH for an IFS truck. I know guys with 2 1/2" & 3" pucks who have taken them out due to vibration issues, plus it puts the CVs at too high an angle, not to mention the stress on ball joints and tie rods.
Rule of thumb, 2" on level kits, any higher, spend the money on a true body or suspension lift...
As long as it's not that "Adrenaline Kit", do a search for that one, it's a total POS, EVERYBODY who's bought that one has taken it right back off and I believe the company has given them trouble trying to return it if it's been installed.