Speedometer gear

When I switch my rear axle assembly from it' stock gearing to something like a 3.08, 3.27 or a 3.55 I also have to switch the gear in the transmission for teh speedometer, anyone know how difficult that is?

Very easy!

http://www.crownvic.net/ubbthreads/showflat.php?Cat=&Board=UBB23&Number=411049&page=&view=&sb=5&o=&fpart=1&vc=1