How difficult is it to swap gears in differentials while they are still under the rig? (14 bolt FF and D60) I have a friend with a 1-ton Crew Cab and we just discovered today he has 4.56 gears in it. I have 4.10's in mine. He's only going to run about a 34" tall tire and I'm going to run 44" tires; so I offered a trade of my 4.10 gears for his 4.56's. I figured it'd be easier to swap out the whole differentials, but I don't think he wants to do that.