Can someone who has installed this set up please tell me how much lift it adds? It's going on a 2010 Limited with the 4.6. The company tells me the rear adds about an inch. Not sure how that is possible. The spacer is about an 1.5". Not sure the rear ratio, but it has to be more then 1 to 1. How bad are the C/V axle angles? How soon do the boots fail or even the joints? How many miles have some of you have had a lift kit on? This is the start of many mods I have for the truck. Thanks for any help and advice with this.