New to Chevy's, just bought a 1970 C10

[Pickupmanx2]

Evening all, just wanted to say hey, I am an old Ford truck guy, but I have a soft spot for ALL old things, so I ended up buying a 1970 C10 yesterday, it has the 400/400 combo, A/C, PS/PB , nice running old truck, has an exhaust leak, and needs a tune up, but it all works! I will post some pictures as soon as the rain stops and I can take some. I am not new to old trucks, I have a 77 F150 4x4 and a 63 F250 4X4, and have had quite a few older trucks. But I am new to Chevys, so I will be browsing and asking questions as they come, I am a member over at ford-trucks.com, and this has a VERY similar format, so here I am.
VIN is CE140Z144440 model # is CE10934, and it has all this on the glovebox door: BX2, C60, F59, JM1, L47, NA9, U63, V46, Z62, 600, A11, B85, F51, G50, J70, M49, N40, V43, Z53, 526
Does the rear axle have a tag as to the ratio? It is a 12 bolt, what were the common ratios?
Any other info is great,
Thanks
Joe