For those who saw my Yeti build thread my latest add was a 4 inch rough country lift kit. The truck looks and drives good and was level to begin with, but as soon as I loaded in my tools and search and rescue gear (probably 300+ pounds) the back end is low again. Also, when I did the lift even with the wedge to turn the back axle up my driveline is a little short for my taste and has developed a shake ove 60mph. I need to crawl underneath tonight and change the fuel filter and install my lengthend rear brake line, and was considering installing my zero rates to level the rig back up. So question is, while I'm doing that should I slide my axle forward an inch or inch and 1/2 to gain back some driveline? The drive angles aren't bad so I don't think that would be a problem but am I opening myself up to other problems?