I did the obligatory search, but couldn't find anything. What's the difference between the suspension on the 4wd vs the 2wd that makes it sit up higher. I know that on the 4wd the axle is under the leaf as opposed to over on the 2wd. (I'm a 2wd owner.) What's different on the front end of the 4wd to bring it up to match the axle under leaf rear?