VIN Number Decoder - Here It Is - Check Your Vin number
I know people want to know what their VIN Number means. If you click on the link here, it will take you to the VIN Decoder. All you do is type your VIN Number in, and it tells you what your truck is. There is also a place to click on your year, and it will pull up more info for all the makes and models for that year. Check it out.
There should be a sticker somewhere inside the driver door. It will have your axle code. There is a thread in the tech folder for axle codes. Or you can post your axle code, and someone will help you. Good luck.
I don't know how far back it goes. I tried to put in an '06 and it didn't have it. Not sure if it's just from '08 forward, or exactly what the criteria is for having the data at the site is. Might not even be by year for all I know.