Hey its aggie..

We have the 10 bolt rear end (If not Its 12 but pretty sure 10)..the 14 bolt I believe is the bigger rear ends that come on the HD trucks....

But yea the 6 lug is the 1/2 ton trucks only and 8 lugs are on the 3/4 ton trucks...

Im not sure what gears you have but they are either 3.42 or 3.73..According to our manuals thats what they are...Im pretty sure mines the 3.42 though..