I was wondering that too lol, thanks for re-opening it. I am going to call a few off-road shops tomorrow to get a price range for install and then I'll let you know if I'll buy your front diff. After ya'll did this gear swap on your buddy's 3.7L WK, were there any noticeable changes in mpg? I commute to downtown Houston everyday, so an increase in mpg could possibly make these gears pay for themselves.