Ok....So I had no idea what gears my truck came with so I had done some math found elswhere on this site and somehow came up with 5:13. Just got done taking the cover off to change the 90w and thought I'd count the teeth. 37 ring 9 pinion. Tha6t comes out to 4.11s. Then why the hell does my truck turn 3000 rpms while doing 60? I have 35s on it. Also, I thought that 4.11s where a posi gear. As in I though gm only put 4.11s in with a posi rear. Yes? No? Bueller? It's a 74. Dana 44 front, 12 bolt rear. Thanks guys.