I don't know what the gears are in the '53 but the '55 will have 3:90 gears.
They say the 2 groove signaw is the way to go but with a 1-1 fourth gear it wont help with freeway speeds with the 3:90 gears.
If you do a lot of freeway speed driving you may want to look at the 3:38 ring and pinion kits for the '55 rear end.