Most all 81-87 SWB C10 that Ive seen all had a 4 leaf pack(3 thin plus 1 thick overload). Did the PO tell you that he removed a leaf or are you guessing he did? By the looks of this after pic the front looks like it only lowered by about 2.5-3in from stock, not 4.5in. Are you sure the front springs are fully seated in the pockets top and bottom? BTW adding a leaf will lift the rear 1-2in, the short leafs lift more than the longer leafs.
