Not a gmt400 but it is my new truck.

[Solid94]

I bought it the way it sits lift wise. I'm assuming they are 6 or 8 inch springs because the conversion adds 3 inches and I'm a little taller than my girls truck and hers is a 7 1/2 inch lift with a 3 inch body lift. But the pack I have has literally 12 leafs so I am sure that's the problem but they are not add a leafs because they all have the same cut.

 

[dirtyhick42]

I would honestly bite the bullet and go with some 52s. start with stock because they can be had cheap and then see where you need to go from there.

 

[Solid94]

yea i talked to offroad direct and id need their front hanger turned around and then push my rear hanger back to keep the axle centered then some springs

 

[dirtyhick42]

Well I know it sounds like a pain but your not gonna get any 47s that are gonna ride that great after you get that high so you might as well leave the ones on that you have now and save up for the swap.