2.7 gears in a 3.5?

[dezracer]

The final drive gears in the differentialI in the 2.7 are lower than in the 3.5 to help "pull it a long" I dont think its an option on the limited but I wish they were.Anyone have any thoughts on the swap?Difficulty,price etc.
I know that of all the mods I did to my Mustang Cobra, The gear swap to a lower final drive was what REALLY WOKE HER UP.

[FStephenMasek]

Changing the gears is the easy part. The hard part is everything else - the speed sensors for the antilock brakes may need to be changed, and the computer will have to be reprogrammed.