Funny this topic appeared as I picked up my 2011 4/4 ford G/Box, yesterday after having the rear axle changed to 4.1.1 (parts have been on order since feb from mmc)
Well what can I say it was like picking up a new car. 30mph in 4th 40 in 5th & somehow the engine seems "freeer" accelerating from 70 to 80 (um private rd:)) just happens in 5 th. in a nut shell now drives like you'd expect. Transforms the car.
But not sure how true this is but I was warned that the supplied gears can be noisy.
Not a cheap job but after only 2 days IMHO well worth it.
Bob:)
