[big gear head]

Are you wanting new or used gears? You might find them used in some '82 to current 1/2 ton trucks. If you want something with a certain date then that's going to be hard to find. I don't know of any cars that got the 4.10 with the 8.5, unless you could get them in a '71 - '73 Z28. If you want new gears then you can get them from AAM, who is the OEM supplier. There are several places that sell AAM gears.