PRE-ALIGNMENT CHECKS Ensure steering wheel is centered and front wheels are in straight-ahead position (to correct, shorten one tie rod adjusting sleeve and lengthen the opposite sleeve in equal amounts). Ensure none of the following conditions exist: Incorrect vehicle ride height (see RIDE HEIGHT ). Incorrect tire pressure, mismatched tires (differing size or type), excessive tire runout, unbalanced tire and wheel assemblies, loose wheel bearings, or loose wheel lug nuts. Loose or worn steering linkage/suspension components, or excessive play in steering gear box. CAMBER & CASTER ADJUSTMENT “C”, “G” & “K” Series Except 1999 Sierra & Silverado C1500 & C2500 (Caster Adjustment) 1. Check frame angle. See “C”, “G”, “K” & “P” (FRAME ANGLE) . If corrected caster is not within specification, remove frame bracket slots. See “C”, “G” & “K” SERIES (FRAME BRACKET SLOT REMOVAL) . Reset caster by loosening nut on end of each cam bolt securing upper control arm to frame brackets. See Fig. 18 . 2. Rotate cam bolts until caster is within specification. See WHEEL ALIGNMENT SPECIFICATIONS table. Tighten nuts to specification. See TORQUE SPECIFICATIONS table.