Our most frequent asked question is when to use Close or Wide ratio gearsets:  The Close Ratio Muncie & T10 4 speed 2.20 First Gear is best installed in light weight vehicles, cruising highways with hills and curves, bigger engines.  The Wide Ratio 2.52, 2.54 1st Gears are good for higher rear axle ratio's 3.08 to 3.70; heavier vehicles, under powered, stop light to stop light or towing.