The crank gear's position relative to other components is determined by the timing chain and its relationship to the camshaft. Simply stating the crankshaft is at TDC for #1 doesn't tell you the specific orientation of the crank gear. You need to look at the timing marks on both the crankshaft and camshaft to ensure proper timing. The position of the distributor (if equipped) is also crucial for ignition timing.
In short: TDC for #1 cylinder only tells you the crankshaft position. The crank gear's position is interdependent with the camshaft and the overall timing system. You need to consult a repair manual specific to your 1994 F-150 5.8L for the precise timing mark alignments.
