Need a list of rear axles that are compatible with a 2000 Chevy silverado 4x4 1500

FBB}A}}435}937737" checked="checked" type="radio" name="userInterchange" />4x2, 3.08 ratio (opt GU4)
FBB}B}}435}937738" type="radio" name="userInterchange" />4x2, 3.42 ratio (opt GU6)
FBB}C}}435}937739" type="radio" name="userInterchange" />4x2, 3.73 ratio (opt GT4)
FBB}C}}435}937740" type="radio" name="userInterchange" />4x4, 3.73 ratio (opt GT4)
FBB}D}}435}937741" type="radio" name="userInterchange" />4x4, 4.10 ratio (opt GT5)
you know since it's a 4x4 the front and rear axle HAVE to be the same.