[David Hodgson]

The diff ratios can be changed, but not as simply as say a "nine inch" where the whole centre drops out of the housing, you will need to take it to a diff shop and have the gears changed, or find one with the ratio's you want.

I think you will be happy with the 3.54. The cruisey guys go for 3.31. I ended up with a 3.77, hardly use first gear.