Hi all. I have a 4.5" lift in my Cherokee right now with a transfer case drop. I'm thinking of upgrading to a 6 or 6.5". They are talking about needing a new drive shaft and sye kit. does anybody run a 6" lift with stock driveline components or is it absolutely necessary to upgrade? My cherokee is a pavement queen mostly due to high mileage and dependability issues. Thx all