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Best off to have the job done at a good shop. It all has to be adjusted and shimmed. If the car has say 290's in the back, then 343's would be good, but then, how much fuel would you really save? The crown as is, gets fairly good milage for the size of car. The cost to change the gears is around 300 to 500 bucks. The lower the gears the harder to take off, but with a set of higher gears, the car will take off easier, thus saving fuel that way. Personally, I don't think you will save what you really want to save.
What else can I help you with?
How do you change an oxygen sensor on a 1981 ford ltd crown Victoria?
The 1981 Ford Crown Victoria does not have an Oxygen sensor.
How do you change the starter from a 1998 crown Victoria lx?
How do you change the starter from a 1998 crown Victoria lx? Click on the link in the "Related links" section of this webpage.
How do you change the trunk light of a 92 Ford Crown Victoria?
just change the bulb!
How do you change a fuel pump on a 2002 Crown Victoria?
Its in the gas tank.
How do you change a rotor in a 1995 Crown Victoria?
Follow the Youtube instructions.
How do you change the fuel pump to a 1998 crown Victoria?
Drop the fuel tank
How many quarts do you need to change a transmission filter on a crown Victoria?
6
What grade oil for 2000 Crown Victoria?
5 W 30 - according to the 2000 Ford Crown Victoria owners manual ( 5 quarts / 4.7 liters with filter change )
Will a 2006 Crown Victoria transmission fit a 2004 Crown Victoria?
no
How do you change oil pump on a 2002 crown Victoria?
Have to remove the oil pan to get to the pump.
How do you change the oil pump on 1990 crown Victoria?
Have to remove the oil pan. It's in there.
How do you change oil-pump in 1992 ford crown Victoria?
Have to remove the oil pan to get to it.
