I'm trying to find out what axle ratio my truck has and the data plate on the axle doesn't say what ratio, but the door tag says "AXLE: C5", I'm hoping that's enough of a code to give a ratio and if it's limited slip or not. If anyone can tell me what this means or a URL to decode that info it would be great. Thanks!

 

according to a chart provided by deleon tow somewhere else on this website, the C5 axle code means you have 4.10 gears, and a limited slip differentail

 

The Ford book that came with my truck code c5 is 4.10 gears with limited slip

 

Thanks guys. Now that I know what it is, I can see how the axle tag makes sense. The rear axle tag says "4L10", and being limited slip that makes sense instead of it being "4.10". Now I just have to test it.