i have had a 14 bolt sitting in my yard for a while and i am close to installing it. i felt lucky that the spring pads were correct width but i was under the impression that it had a 4:10 or 4:56 ratio. i open the diff and check the numbers on the ring and the last few are 14 45 10 86. does that mean it's a 3:21 made in oct. 86? i never heard of 3:21. what options do i have to regear? is there a carrier break? what do i do?