The tag on my diff is gone, that's why I never noticed it before. Tho 3.54 gear ratio diff's should be tag? Also you guys are saying that 3.54 diff's can but rare, be a 3.54, they are out there? Also if I found a 4bolt 3.54 can I swap over the guys to my diff(crown and pinion) on order to save on the cost of axles and hubs?