I'm going with 4.56's also and need to know about this "pin modification" I picked my car up today from getting the subframes installed and tq boxes welded up and the guy tells me I need a "backcut pin" in order to properly install the gears. What is he talking about? I'm pretty much a know nothing when it comes to diffs and gear swaps. Where can I get this modified pin, or where can I get a stock one and have it machined(I work at a steel fabrication company with a rather well equipped machine shop, so I could get it done there)? How much does one run, whether stock or modified?