I am wanting to increase my vehicles GVWR, it is a 2002 silverado 1500, with a 5.3l engine, 4.56 gears, air bag helper springs in rear, along with 6.5" lift springs. also have 35" 10 ply E-Rated Tire.

GVWR - 6400 lbs
GAWR FRT - 3925
GAWR RR - 3750

Looking to bump up my GVWR. Power isn't the problem