I have an 04 fx4 and my axle code is b6. I did some searching and found out that it's a 3.73 ratio but when I get on eBay or other parts stores all the ring and pinion kits say they only fit 04 herritage and 05-10. Is there something different about this rear end in 04? I've looked at Yukon and motive on eBay and all of them leave out the 04 new style. How many teeth should there be? Also what else do I need for redoing the ring and pinion? I want to buy everything so the shop can just put it in.