Hi I currently own a 1995 k3500 double cab srw with 8' box. It has the 5.7L and 4l80E with corp. 14 bolt with 4:10 ratio. When I put about 5-600lbs in the bed and hooked up our camper with 750-800lbs of tongue weight my truck squatted pretty good. About as mush as my 1/2 ton Suburban did...