I blew out a seal on my D30. Should I swap in a set of axles from a 4cyl with 4.10's (I currently have 3.07's); pay 550 in labor and another 400 in parts to regear the front and rear (550 includes new seals and such); or just have the seal replaced in the front D30? My YJ with a 4.0l can not maintain a speed in 5th gear (unless I have the wind at my back), and on the way back from Vegas I was losing speed going downhill in 4th. Will I be able to resell my axles if I swap in a set of 4cyl axles? Thanks for your opinions, Lane.