Yukon
http://www.ringpinion.com/ProductDet...px?ProdID=5662

U.S Gear
http://www.ringpinion.com/ProductDet...px?ProdID=2480

 

you guys need to remember, he is running a 4.7, not a hemi, the 4.56 might be a little over kill for the motor, i am running 4.10 in my dakota with the 4.7 and have seen better mileage around town and about 1 less on the highway,

 

OP, go with the 4.56 with those 34's.

I'm really wanting to change to 4.56 myself. I have 3.55's now, and I am not happy with this gearing. With the truck's desire to be in a higher gear, combined with the hilly and mountainous terrain around here, I'm finding my truck is often in a ratio that is too tall for the situation. When I start towing and hauling, the situation will be worse.