Hi & an axle question :)

[Squeak]

Hiya Just found these boards and hoping some of you might be able to help.
I need to know what axles came in Chevy trucksand what years and models they where in.
gearing doesn't matter, but I need to find out the bolt patterns.
But, I mostly need to know where I can find out what they use from the factory in front and rear and the years.
Hope that makes sense

Thanks

Kate