Hey GMTC! I obviously am new and wanted to introduce myself to this wonderful forum. My name is Marcus, I live in Sunny California. A little too sunny if you ask me LOL. Anyway I have just aquired a 2001 Suburban 2500 with the 6.0L V8 and 4.10 rear locking Diff (GT5 and G80 rpo codes as I have read) I am very pleased with it thus far, I am getting ready to do some minor service work to it to get it up to date in my books.