how much lift to run 40's? minimum.?

[HGW]

fallen---where did you hear that they are going to make 4.88 gears for the front diff? I'd like to look into it. All my sources (plus GM) says the front diff will only support 4.56. I'd love to have 4.88s vice 4.56--please let me know where you heard this---thanks.

Definately use 6" plus lift for 40's x 15.5's to not rub--I have a true 6.5" FTS lift with tweaked torsion bars for close to 8"---I have 38 x 15.5's, and good shocks--could go to 40" easily.

I am skeptical on the 5.5 and 6 kits because they spread the upper amd lower control arms with different spindles--them you put 40" X 15.5" on with heavy 22' wheels ---it is OK but watch heavy abuse type on or off roading.

The FTS kits (and others) lower both the upper control arms and the lower control arms maintaining factory spindles, rather than just speading the upper and lower by dropping the lower like fabeck and skyjackerusing new spindles---I know no one who has been happy with the skyjacker kit.